Migrate File Shares tools to new tool design

[alzimmermsft]

What does this PR do?

Migrates File Shares tools to new design where Register and Bind options are based on Option attributes.

GitHub issue number?

[Link to the GitHub issue this PR addresses]

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Pull request overview

Migrates the Azure File Shares toolset to the newer command/options design by removing manual option registration/binding and switching to [Option]-attribute-based option binding, along with updating commands, models, and tests to match the new patterns.

Changes:

• Replaced legacy RegisterOptions/BindOptions + FileSharesOptionDefinitions usage with [Option]-decorated option POCOs implementing ISubscriptionOption.
• Updated File Shares commands to the newer SubscriptionCommand<TOptions, TResult> pattern and aligned response/result shapes.
• Updated unit/integration tests and removed now-unnecessary global usings and System.CommandLine references.

Reviewed changes

Copilot reviewed 60 out of 60 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
tools/Azure.Mcp.Tools.FileShares/tests/Azure.Mcp.Tools.FileShares.Tests/Snapshot/SnapshotUpdateCommandTests.cs	Switches unit test base to subscription-aware test base and updates imports.
tools/Azure.Mcp.Tools.FileShares/tests/Azure.Mcp.Tools.FileShares.Tests/Snapshot/SnapshotGetCommandTests.cs	Switches unit test base to subscription-aware test base and updates imports.
tools/Azure.Mcp.Tools.FileShares/tests/Azure.Mcp.Tools.FileShares.Tests/Snapshot/SnapshotDeleteCommandTests.cs	Switches unit test base to subscription-aware test base and updates imports.
tools/Azure.Mcp.Tools.FileShares/tests/Azure.Mcp.Tools.FileShares.Tests/Snapshot/SnapshotCreateCommandTests.cs	Switches unit test base to subscription-aware test base and updates imports.
tools/Azure.Mcp.Tools.FileShares/tests/Azure.Mcp.Tools.FileShares.Tests/PrivateEndpointConnection/PrivateEndpointConnectionUpdateCommandTests.cs	Switches unit test base to subscription-aware test base and updates imports.
tools/Azure.Mcp.Tools.FileShares/tests/Azure.Mcp.Tools.FileShares.Tests/PrivateEndpointConnection/PrivateEndpointConnectionGetCommandTests.cs	Switches unit test base to subscription-aware test base and updates imports.
tools/Azure.Mcp.Tools.FileShares/tests/Azure.Mcp.Tools.FileShares.Tests/Informational/FileShareGetUsageDataCommandTests.cs	Switches unit test base and updates imports for new command/options pattern.
tools/Azure.Mcp.Tools.FileShares/tests/Azure.Mcp.Tools.FileShares.Tests/Informational/FileShareGetProvisioningRecommendationCommandTests.cs	Switches unit test base and updates imports for new command/options pattern.
tools/Azure.Mcp.Tools.FileShares/tests/Azure.Mcp.Tools.FileShares.Tests/Informational/FileShareGetLimitsCommandTests.cs	Switches unit test base and updates imports for new command/options pattern.
tools/Azure.Mcp.Tools.FileShares/tests/Azure.Mcp.Tools.FileShares.Tests/GlobalUsings.cs	Removes test project global usings (migrated to per-file usings).
tools/Azure.Mcp.Tools.FileShares/tests/Azure.Mcp.Tools.FileShares.Tests/FileSharesCommandTests.cs	Updates snapshot delete invocation/response assertions to match new option/response shape.
tools/Azure.Mcp.Tools.FileShares/tests/Azure.Mcp.Tools.FileShares.Tests/FileShare/FileShareUpdateCommandTests.cs	Updates tests to new option binding/test harness helpers and renames option fields.
tools/Azure.Mcp.Tools.FileShares/tests/Azure.Mcp.Tools.FileShares.Tests/FileShare/FileShareGetCommandTests.cs	Switches unit test base and updates imports for new command/options pattern.
tools/Azure.Mcp.Tools.FileShares/tests/Azure.Mcp.Tools.FileShares.Tests/FileShare/FileShareDeleteCommandTests.cs	Switches unit test base and updates imports for new command/options pattern.
tools/Azure.Mcp.Tools.FileShares/tests/Azure.Mcp.Tools.FileShares.Tests/FileShare/FileShareCreateCommandTests.cs	Updates tests to new option binding/test harness helpers and renames option fields.
tools/Azure.Mcp.Tools.FileShares/tests/Azure.Mcp.Tools.FileShares.Tests/FileShare/FileShareCheckNameAvailabilityCommandTests.cs	Switches unit test base and updates imports for new command/options pattern.
tools/Azure.Mcp.Tools.FileShares/tests/Azure.Mcp.Tools.FileShares.Tests/assets.json	Updates recorded test assets tag reference.
tools/Azure.Mcp.Tools.FileShares/tests/Azure.Mcp.Tools.FileShares.Tests/AssemblyAttributes.cs	Adds explicit Xunit using after removing global usings.
tools/Azure.Mcp.Tools.FileShares/src/Services/IFileSharesService.cs	Updates usings to align with model namespace changes (no global using reliance).
tools/Azure.Mcp.Tools.FileShares/src/Services/FileSharesService.cs	Adjusts usings and updates return construction to match new record-based models.
tools/Azure.Mcp.Tools.FileShares/src/Options/Snapshot/SnapshotUpdateOptions.cs	Converts to [Option]-based, ISubscriptionOption-implementing POCO with required fields.
tools/Azure.Mcp.Tools.FileShares/src/Options/Snapshot/SnapshotGetOptions.cs	Converts to [Option]-based, ISubscriptionOption-implementing POCO.
tools/Azure.Mcp.Tools.FileShares/src/Options/Snapshot/SnapshotDeleteOptions.cs	Converts to [Option]-based, ISubscriptionOption-implementing POCO with required fields.
tools/Azure.Mcp.Tools.FileShares/src/Options/Snapshot/SnapshotCreateOptions.cs	Converts to [Option]-based, ISubscriptionOption-implementing POCO with required fields.
tools/Azure.Mcp.Tools.FileShares/src/Options/PrivateEndpointConnection/PrivateEndpointConnectionUpdateOptions.cs	Converts to [Option]-based, ISubscriptionOption-implementing POCO with required fields.
tools/Azure.Mcp.Tools.FileShares/src/Options/PrivateEndpointConnection/PrivateEndpointConnectionGetOptions.cs	Converts to [Option]-based, ISubscriptionOption-implementing POCO.
tools/Azure.Mcp.Tools.FileShares/src/Options/Informational/FileShareGetUsageDataOptions.cs	Converts to [Option]-based, ISubscriptionOption-implementing POCO with required fields.
tools/Azure.Mcp.Tools.FileShares/src/Options/Informational/FileShareGetProvisioningRecommendationOptions.cs	Converts to [Option]-based options; renames storage option to ProvisionedStorageInGiB.
tools/Azure.Mcp.Tools.FileShares/src/Options/Informational/FileShareGetLimitsOptions.cs	Converts to [Option]-based, ISubscriptionOption-implementing POCO with required fields.
tools/Azure.Mcp.Tools.FileShares/src/Options/FileSharesOptionDescriptions.cs	Adds centralized string constants for option descriptions used by [Option] attributes.
tools/Azure.Mcp.Tools.FileShares/src/Options/FileSharesOptionDefinitions.cs	Removes legacy System.CommandLine Option<> definitions.
tools/Azure.Mcp.Tools.FileShares/src/Options/FileShare/FileShareUpdateOptions.cs	Adds new [Option]-based options type for update command.
tools/Azure.Mcp.Tools.FileShares/src/Options/FileShare/FileShareListOptions.cs	Removes legacy list options type (previously inherited base options).
tools/Azure.Mcp.Tools.FileShares/src/Options/FileShare/FileShareGetOptions.cs	Converts to [Option]-based options and renames FileShareName to Name.
tools/Azure.Mcp.Tools.FileShares/src/Options/FileShare/FileShareDeleteOptions.cs	Converts to [Option]-based options and renames FileShareName to Name.
tools/Azure.Mcp.Tools.FileShares/src/Options/FileShare/FileShareCreateOptions.cs	Converts to [Option]-based create options (split from prior create-or-update options).
tools/Azure.Mcp.Tools.FileShares/src/Options/FileShare/FileShareCheckNameAvailabilityOptions.cs	Converts to [Option]-based options and renames FileShareName to Name.
tools/Azure.Mcp.Tools.FileShares/src/Options/BaseFileSharesOptions.cs	Removes legacy shared base options type.
tools/Azure.Mcp.Tools.FileShares/src/Models/PrivateEndpointConnectionDataSchema.cs	Removes unused model import after refactors.
tools/Azure.Mcp.Tools.FileShares/src/Models/FileShareUsageDataResult.cs	Converts usage data models to records.
tools/Azure.Mcp.Tools.FileShares/src/Models/FileShareProvisioningRecommendationResult.cs	Converts recommendation result model to record.
tools/Azure.Mcp.Tools.FileShares/src/Models/FileShareLimitsResult.cs	Converts limits/provisioning constants to records.
tools/Azure.Mcp.Tools.FileShares/src/GlobalUsings.cs	Removes src global usings (replaced with explicit file usings).
tools/Azure.Mcp.Tools.FileShares/src/FileSharesJsonContext.cs	Simplifies JSON context declaration to file-scoped form.
tools/Azure.Mcp.Tools.FileShares/src/Commands/Snapshot/SnapshotUpdateCommand.cs	Migrates command to SubscriptionCommand<TOptions, TResult> and removes manual binding.
tools/Azure.Mcp.Tools.FileShares/src/Commands/Snapshot/SnapshotGetCommand.cs	Migrates command to SubscriptionCommand<TOptions, TResult> and removes manual binding.
tools/Azure.Mcp.Tools.FileShares/src/Commands/Snapshot/SnapshotDeleteCommand.cs	Migrates command to SubscriptionCommand<TOptions, TResult> and updates response result type.
tools/Azure.Mcp.Tools.FileShares/src/Commands/Snapshot/SnapshotCreateCommand.cs	Migrates command to SubscriptionCommand<TOptions, TResult> and removes manual binding.
tools/Azure.Mcp.Tools.FileShares/src/Commands/PrivateEndpointConnection/PrivateEndpointConnectionUpdateCommand.cs	Migrates command to SubscriptionCommand<TOptions, TResult> and removes manual binding.
tools/Azure.Mcp.Tools.FileShares/src/Commands/PrivateEndpointConnection/PrivateEndpointConnectionGetCommand.cs	Migrates command to SubscriptionCommand<TOptions, TResult> and removes manual binding.
tools/Azure.Mcp.Tools.FileShares/src/Commands/Informational/FileShareGetUsageDataCommand.cs	Migrates command to SubscriptionCommand<TOptions, TResult> and removes manual binding.
tools/Azure.Mcp.Tools.FileShares/src/Commands/Informational/FileShareGetProvisioningRecommendationCommand.cs	Migrates command to SubscriptionCommand<TOptions, TResult> and removes manual binding.
tools/Azure.Mcp.Tools.FileShares/src/Commands/Informational/FileShareGetLimitsCommand.cs	Migrates command to SubscriptionCommand<TOptions, TResult> and removes manual binding.
tools/Azure.Mcp.Tools.FileShares/src/Commands/FileShare/FileShareUpdateCommand.cs	Migrates command to SubscriptionCommand<TOptions, TResult> and updates option field names.
tools/Azure.Mcp.Tools.FileShares/src/Commands/FileShare/FileShareGetCommand.cs	Migrates to SubscriptionCommand<TOptions, TResult> and adds option validation for --resource-group/--name.
tools/Azure.Mcp.Tools.FileShares/src/Commands/FileShare/FileShareDeleteCommand.cs	Migrates command to SubscriptionCommand<TOptions, TResult> and removes manual binding.
tools/Azure.Mcp.Tools.FileShares/src/Commands/FileShare/FileShareCreateCommand.cs	Migrates command to SubscriptionCommand<TOptions, TResult> and removes manual binding.
tools/Azure.Mcp.Tools.FileShares/src/Commands/FileShare/FileShareCheckNameAvailabilityCommand.cs	Migrates command to SubscriptionCommand<TOptions, TResult> and removes manual binding.
tools/Azure.Mcp.Tools.FileShares/src/Commands/BaseFileSharesCommand.cs	Removes legacy base command abstraction (no longer needed with new pattern).
tools/Azure.Mcp.Tools.FileShares/src/Azure.Mcp.Tools.FileShares.csproj	Aligns ProjectReference to $(RepoRoot) and removes direct System.CommandLine dependency.