[http-client-csharp] Preserve ApiCompat acronym names after namespace updates

[JoshLove-msft]

Summary

• preserve last-contract model and enum spelling when namespace visitors relocate generated types
• fall back from the normalized generated name to the original input name only when the names differ solely by supported acronym normalization
• retain enum input metadata so the compatibility lookup can use that fallback
• add regression coverage for model properties and enums after namespace updates

Validation

• dotnet test packages/http-client-csharp/generator/Microsoft.TypeSpec.Generator/test/Microsoft.TypeSpec.Generator.Tests.csproj --no-restore --verbosity minimal -p:NuGetAudit=false (1905 passed)

Fixes #11696

[pkg-pr-new]

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npm i https://pkg.pr.new/@typespec/http-client-csharp@11701

commit: 5186bc6

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[Copilot]

Pull request overview

This PR updates the http-client-csharp generator’s ApiCompat name preservation so that previously-shipped acronym casing (from ApiCompatVersion last-contract baselines) is still honored even after namespace relocation visitors move generated types.

Changes:

• Extend TypeProvider last-contract lookup to fall back from the normalized generated name to the original input identifier name when the difference is only supported acronym normalization.
• Ensure enum providers retain input metadata for the above fallback by flowing the input type into the TypeProvider base.
• Add regression tests covering model property and enum name preservation after namespace updates.

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 3 comments.

File	Description
packages/http-client-csharp/generator/Microsoft.TypeSpec.Generator/test/Providers/ModelProviders/ModelProviderTests.cs	Adds a regression test for model/property back-compat name preservation after a namespace update.
packages/http-client-csharp/generator/Microsoft.TypeSpec.Generator/test/Providers/EnumProviders/EnumProviderTests.cs	Adds a regression test for enum back-compat name preservation after a namespace update.
packages/http-client-csharp/generator/Microsoft.TypeSpec.Generator/src/Providers/TypeProvider.cs	Implements acronym-aware fallback when resolving last-contract views and uses last-contract name to stabilize identity after updates.
packages/http-client-csharp/generator/Microsoft.TypeSpec.Generator/src/Providers/EnumProvider.cs	Passes enum input type into TypeProvider so last-contract fallback has access to original names.

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[Copilot]

Pull request overview

Copilot reviewed 6 out of 6 changed files in this pull request and generated no new comments.