[main] Update dependencies from dotnet/roslyn

[dotnet-maestro[bot]]

This pull request updates the following dependencies

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

• Subscription: 8a4332aa-2543-4c51-b941-e73f31e22328
• Build: 20250614.1
• Date Produced: June 14, 2025 9:53:48 AM UTC
• Commit: e15bc0a7eb664d20e7237daef7ab6b76da6c16cb
• Branch: refs/heads/main-vs-deps

• Updates:
  • Microsoft.Net.Compilers.Toolset: from 4.14.0-3.25262.10 to 5.0.0-1.25314.1

[rainersigwald]

Opened dotnet/roslyn#78956.

[AR-May]

Removed the Microsoft.CodeAnalysis.Build.Task package and hid the Csc usage behind ifdef. So, we can run some of the tests in the file but not compile other (and keep code for the slim chance that we will return to fix those skipped tests eventually).

[AR-May]

/azp run

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