[http-client-csharp] Preserve cref tags in parameter docs

[nightcityblade]

Fixes #11768

Summary

• route parameter XML documentation through the existing structured-content processor instead of flattening it with XElement.Value
• preserve <see cref="..."/> references while retaining the existing type-prefix cleanup
• add a regression test that fails on main with missing type references and passes with the fix

Testing

• dotnet test packages/http-client-csharp/generator/Microsoft.TypeSpec.Generator/test/Microsoft.TypeSpec.Generator.Tests.csproj --no-restore --filter FullyQualifiedName~NamedTypeSymbolProviders --nologo (78 passed)
• dotnet format packages/http-client-csharp/generator/Microsoft.TypeSpec.Generator.sln whitespace --verify-no-changes --no-restore --include packages/http-client-csharp/generator/Microsoft.TypeSpec.Generator/src/Providers/NamedTypeSymbolProvider.cs packages/http-client-csharp/generator/Microsoft.TypeSpec.Generator/test/Providers/NamedTypeSymbolProviders/XmlDocsTests.cs --verbosity minimal
• git diff --check

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[Copilot]

Pull request overview

This PR fixes a regression in the C# HTTP client generator where XML <param> documentation was being flattened to plain text, causing <see cref="..."/> references to be silently dropped when reading docs back from symbols (e.g., via last-contract views).

Changes:

• Updates parameter XML doc extraction to reuse the existing structured XML content processing (instead of XElement.Value), preserving <see cref="..."/> tags while keeping the existing T: prefix cleanup behavior.
• Adds a regression test to validate that parameter docs retain <see cref="..."/> content after round-tripping through symbol XML docs.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
packages/http-client-csharp/generator/Microsoft.TypeSpec.Generator/src/Providers/NamedTypeSymbolProvider.cs	Routes <param> doc extraction through ProcessXmlContent so <see cref="..."/> tags are preserved.
packages/http-client-csharp/generator/Microsoft.TypeSpec.Generator/test/Providers/NamedTypeSymbolProviders/XmlDocsTests.cs	Adds a regression test ensuring parameter descriptions keep <see cref="..."/> references and type-prefix cleanup.

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