[release/10.0.2xx] Source code updates from dotnet/roslyn

[dotnet-maestro]

Note

This is a codeflow update. It may contain both source code changes from
the source repo
as well as dependency updates. Learn more here.

This pull request brings the following source code changes

From https://github.com/dotnet/roslyn

• Subscription: 0b3bbcef-3584-48a2-be30-645edcab5d8e
• Build: 20251210.11 (294248)
• Date Produced: December 11, 2025 12:33:32 AM UTC
• Commit: 46a48b8c1dfce7c35da115308bedd6a5954fd78a
• Commit Diff: 9143e6e...46a48b8
• Branch: main

Diff the source with this PR branch

darc vmr diff --name-only https://github.com/dotnet/roslyn:46a48b8c1dfce7c35da115308bedd6a5954fd78a..https://github.com/dotnet/dotnet:darc-release/10.0.2xx-61f9242e-9455-4765-a90c-be210868001a

[dotnet-maestro]

Note

PRs from original repository included in this codeflow update:

• Do not report parse errors for '#:' in miscellaneous files roslyn#81385
• Centralize recognized feature flags roslyn#81591
• Fix signed build sign validation roslyn#81641
• [main] Update dependencies from dotnet/arcade roslyn#81622
• [main] Update dependencies from dotnet/roslyn roslyn#81624
• Add '-test' to the prerelease label for test signed builds roslyn#81630
• Fix SG items appearing in navto roslyn#81634
• Add some lambda parsing tests. roslyn#81621
• Revert "Remove the EnsureComponentModelAsync from the main thread queue" roslyn#81620
• Fix CS1003 error message when expression follows identifier without '=' roslyn#81285
• [main] Update dependencies from dotnet/arcade roslyn#81550

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