test(codegen): pass cancellation token to diagnostics

[ReubenBond]

Fixes #10856.

Passes TestContext.Current.CancellationToken to Roslyn diagnostic collection in GeneratedWarningSuppressionTests, satisfying xUnit1051 and restoring warning-as-error builds for the test project.

This keeps cancellation flowing through the potentially long-running diagnostic operation without changing the test's assertions or generated-code behavior.

Microsoft Reviewers: Open in CodeFlow

[Copilot]

Copilot review overview

Review tier: Lite
Findings: None

What changed in this PR

This PR fixes the test project build break caused by xUnit1051 by ensuring Roslyn diagnostic collection in GeneratedWarningSuppressionTests respects xUnit’s cancellation flow, restoring warning-as-error builds without changing test intent.

Changes:

• Passes TestContext.Current.CancellationToken into CSharpCompilation.GetDiagnostics(...) for the obsolete-warning suppression assertions.

File	Description
test/​Orleans.CodeGenerator.Tests/​GeneratedWarningSuppressionTests.cs	Threads TestContext.Current.CancellationToken into Roslyn diagnostics collection to satisfy xUnit1051 and keep cancellation propagation.

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[ReubenBond]

CI restore failures in this run are unrelated to this change: Azure DevOps NuGet feeds are returning HTTP 500 / Maximum waiter thread limit 500 is reached across 21+ matrix jobs. Local dotnet build Orleans.slnx -bl succeeds at 7057ea85e1, and the focused tests pass. Tracked in #10881; failed jobs should be rerun after feed recovery.

[github-actions]

Code coverage

78.54% line coverage - 99,430 / 126,605 lines

Coverage details

• Source files: 1,662
• Scope: every CI test matrix job, including providers, CodeGen, .NET 8/10, Linux, Windows, and macOS
• Sources: maintained repository code under src/ loaded by the complete CI test scope
• Commit: 7057ea85e1
• View the test run and merged coverage artifact
• View the coverage reporting run

[ReubenBond]

The Azure DevOps NuGet feed recovered. Failed-job rerun attempt 2 completed successfully: all 75 PR checks now pass.