Obsolete Bootstrap 4 Identity UI support

[Copilot]

Obsolete Bootstrap 4 Identity UI support

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Warn when the default Identity UI selects obsolete Bootstrap 4.

Description

Change

• Adds an MSBuild warning when IdentityUIFrameworkVersion is Bootstrap4.
• Leaves Bootstrap 5 selection unchanged.

<IdentityUIFrameworkVersion>Bootstrap4</IdentityUIFrameworkVersion>

• Fixes Consider obsoleting Bootstrap 4 support in the default Identity UI package #63191

[Youssef1313]

@copilot Create a property to disable this warning, and use that property to disable the warning in IdentitySample.DefaultUI.csproj

[Copilot]

@copilot Create a property to disable this warning, and use that property to disable the warning in IdentitySample.DefaultUI.csproj

Implemented in 090ee1f. SuppressBootstrap4IdentityUIWarning disables the warning, and IdentitySample.DefaultUI now sets it to true.

[Copilot]

Pull request overview

Adds a build-time MSBuild warning when a consuming project selects the Bootstrap 4 Identity UI framework version, signaling that Bootstrap 4 support is obsolete and will be removed in a future release, while keeping Bootstrap 5 as the default.

Changes:

• Introduces an MSBuild target that emits a warning when IdentityUIFrameworkVersion resolves to Bootstrap4 (with an opt-out property).
• Suppresses the new warning in the Identity Default UI test asset project that intentionally uses Bootstrap 4.
• Suppresses the new warning in the Identity Default UI sample project that intentionally uses Bootstrap 4.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 1 comment.

File	Description
src/Identity/UI/src/StaticWebAssets.Groups.targets	Adds an MSBuild warning target when Bootstrap 4 is selected for Identity UI.
src/Identity/testassets/Identity.DefaultUI.WebSite/Identity.DefaultUI.WebSite.csproj	Sets SuppressBootstrap4IdentityUIWarning to keep test asset builds warning-free while using Bootstrap 4.
src/Identity/samples/IdentitySample.DefaultUI/IdentitySample.DefaultUI.csproj	Sets SuppressBootstrap4IdentityUIWarning to keep the sample build warning-free while using Bootstrap 4.

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