Fix RedirectedOutputDoesNotUseAnsiSequences test failure

[Copilot]

Description

Fixes the RedirectedOutputDoesNotUseAnsiSequences test failure caused by xunit's background diagnostic reporter thread writing test names to Console.Out while the test has it redirected to a MemoryStream, polluting the captured output.

The fix wraps the test body in RemoteExecutor.Invoke() to run it in an isolated child process where no xunit reporter thread can interfere with Console.Out. This follows the same pattern already used by the sibling test RedirectedOutput_ColorEnvVars_RespectColorPreference in the same file.

Changes

• Changed [Fact] to [ConditionalFact(typeof(RemoteExecutor), nameof(RemoteExecutor.IsSupported))] to gate the test on RemoteExecutor availability
• Wrapped the test body in RemoteExecutor.Invoke(static () => { ... }).Dispose() for process isolation

Testing

• All 4294 System.Console tests pass with 0 failures
• The specific RedirectedOutputDoesNotUseAnsiSequences test passes reliably

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[stephentoub]

@copilot keep going

[Copilot]

@copilot keep going

Build and tests completed successfully. All 4294 System.Console tests pass, including the fixed RedirectedOutputDoesNotUseAnsiSequences test (commit 866f32c). The change wraps the test body in RemoteExecutor.Invoke() to isolate it from xunit's background diagnostic reporter thread that was writing test names to Console.Out while the test had it redirected to a MemoryStream.

[Copilot]

Pull request overview

This PR addresses a flaky System.Console color test (RedirectedOutputDoesNotUseAnsiSequences) by isolating it from xUnit’s background diagnostic output, which can write to Console.Out and corrupt the test’s redirected output capture.

Changes:

• Convert the test from [Fact] to a RemoteExecutor-gated [ConditionalFact].
• Execute the test body inside RemoteExecutor.Invoke(...) to run it in an isolated child process.