C#: Pin tests and disable .NET 10 tests.

[michaelnebel]

In this PR

• Disable the .NET 10 tests (as they appear to be failing after .NET 10 has been installed on the MacOS runners).
• Pin tests to 9.0.304.

[Copilot]

Pull request overview

This PR addresses test stability issues with .NET 10 on MacOS runners by skipping affected tests and pinning SDK versions to prevent version-related failures across the C# integration test suite.

• Skip .NET 10 integration tests due to crashes in the info command
• Pin test SDK versions to 9.0.304 for consistency across multiple test suites
• Pin blazor_net_8 test to SDK version 8.0.401

Reviewed changes

Copilot reviewed 7 out of 7 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
csharp/ql/integration-tests/all-platforms/dotnet_10/test.py	Adds pytest skip decorators to disable both .NET 10 tests
csharp/ql/integration-tests/posix/standalone_dependencies_nuget_config_fallback/global.json	Pins SDK to version 9.0.304
csharp/ql/integration-tests/posix/standalone_dependencies_nuget_config_error_timeout/global.json	Pins SDK to version 9.0.304
csharp/ql/integration-tests/all-platforms/standalone_failed/global.json	Pins SDK to version 9.0.304
csharp/ql/integration-tests/all-platforms/blazor_net_8/global.json	Pins SDK to version 8.0.401 for .NET 8 compatibility
csharp/ql/integration-tests/all-platforms/blazor_build_mode_none/global.json	Pins SDK to version 9.0.304
csharp/ql/integration-tests/all-platforms/blazor/global.json	Pins SDK to version 9.0.304

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[Copilot]

The PR description states tests should be "marked as flaky", but the implementation uses @pytest.mark.skip which completely disables the tests. Consider using @pytest.mark.xfail instead if you want to mark them as expected to fail while still running them, or update the PR description to clarify that the tests are being skipped/disabled rather than marked as flaky.

Suggested change

	@pytest.mark.skip(reason=".NET 10 info command crashes")
	def test1(codeql, csharp):
	codeql.database.create()
	@pytest.mark.skip(reason=".NET 10 info command crashes")
	@pytest.mark.xfail(reason=".NET 10 info command crashes")
	def test1(codeql, csharp):
	codeql.database.create()
	@pytest.mark.xfail(reason=".NET 10 info command crashes")