Migrate Marketplace tools to new tool design

[alzimmermsft]

What does this PR do?

Migrates Marketplace 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]

Pre-merge Checklist

• Required for All PRs
  • Read contribution guidelines
  • PR title clearly describes the change
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  • Added comprehensive tests for new/modified functionality
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  • Updated servers/Azure.Mcp.Server/README.md and/or servers/Fabric.Mcp.Server/README.md documentation
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• Extra steps for Azure MCP Server tool changes:
  • Updated command list in servers/Azure.Mcp.Server/docs/azmcp-commands.md
  • Ran ./eng/scripts/Update-AzCommandsMetadata.ps1 to update tool metadata in azmcp-commands.md (required for CI)
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[Copilot]

Pull request overview

Migrates the Azure Marketplace toolset commands to the newer “options POCO + [Option] attributes” design, removing the legacy RegisterOptions/BindOptions(ParseResult) plumbing and updating unit tests accordingly.

Changes:

• Converted ProductGet / ProductList commands to SubscriptionCommand<TOptions, TResult> with attribute-bound options.
• Replaced the old MarketplaceOptionDefinitions option-registration pattern with [Option]/[OptionContainer] on ProductGetOptions and ProductListOptions.
• Updated Marketplace unit tests to use SubscriptionCommandUnitTestsBase and the new binding flow.

Reviewed changes

Copilot reviewed 13 out of 13 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
tools/Azure.Mcp.Tools.Marketplace/tests/Azure.Mcp.Tools.Marketplace.Tests/Product/ProductListCommandTests.cs	Updates test base to subscription-aware unit test base.
tools/Azure.Mcp.Tools.Marketplace/tests/Azure.Mcp.Tools.Marketplace.Tests/Product/ProductGetCommandTests.cs	Updates test base to subscription-aware unit test base.
tools/Azure.Mcp.Tools.Marketplace/src/Services/MarketplaceService.cs	Adds explicit System.Text.Json import after removing toolset global usings.
tools/Azure.Mcp.Tools.Marketplace/src/Options/Product/ProductListOptions.cs	Replaces SubscriptionOptions inheritance with [Option]-attributed POCO implementing ISubscriptionOption.
tools/Azure.Mcp.Tools.Marketplace/src/Options/Product/ProductGetOptions.cs	Replaces SubscriptionOptions inheritance with [Option]-attributed POCO implementing ISubscriptionOption.
tools/Azure.Mcp.Tools.Marketplace/src/Options/MarketplaceOptionDescriptions.cs	Centralizes shared option description strings (e.g., language).
tools/Azure.Mcp.Tools.Marketplace/src/Options/MarketplaceOptionDefinitions.cs	Removes legacy System.CommandLine option-definition constants and Option<T> instances.
tools/Azure.Mcp.Tools.Marketplace/src/GlobalUsings.cs	Removes toolset-level global usings for System.CommandLine and System.Text.Json.
tools/Azure.Mcp.Tools.Marketplace/src/Commands/Product/ProductListCommand.cs	Migrates command execution to the new options-binding and result-typing model.
tools/Azure.Mcp.Tools.Marketplace/src/Commands/Product/ProductGetCommand.cs	Migrates command execution to the new options-binding and result-typing model.
tools/Azure.Mcp.Tools.Marketplace/src/Commands/MarketplaceJsonContext.cs	Formatting-only tweak to source-gen options attribute layout.
tools/Azure.Mcp.Tools.Marketplace/src/Azure.Mcp.Tools.Marketplace.csproj	Removes direct System.CommandLine dependency and updates core project reference path.
servers/Azure.Mcp.Server/changelog-entries/1784224695208.yaml	Adds a changelog entry for the Marketplace tool changes.