Retry session-state test cleanup on Windows

[Sean McManus (sean-mcmanus)]

Summary

Retry removal of the temporary directory used by the active-document language-change session-state test when Windows briefly reports a filesystem lock after the editor closes.

• Set maxRetries: 10 and retryDelay: 100 on the existing recursive fs.promises.rm call. Linear backoff allows up to 5.5 seconds of retry delays, with no added delay when deletion succeeds immediately.
• Keep the session-state assertions unchanged and continue to report persistent cleanup failures.
• Addresses the cleanup failure in this Windows CI job, following Add Run and Debug session state regression tests #14736.

This PR was investigated and created by GitHub Copilot (in VS Code). Any message starting with ✨Copilot: was sent by Copilot.

Validation

• Native Windows Node reproduction: a child process holding the temporary directory as its working directory causes the original cleanup to fail with EBUSY; the edited cleanup succeeds after the lock is released.
• Focused probes using the test's actual cleanup options cover immediate success, transient EBUSY, retry exhaustion for persistent EBUSY, and propagation of unrelated EACCES errors, with the original cleanup as a negative control.
• TypeScript formatting and syntax/transpilation checks passed. The one-line diff preserves the existing CRLF line endings and passes the corresponding whitespace check.
• The full VS Code integration suite was not rerun locally; Windows, Linux, and macOS CI will provide that validation.

[Copilot]

🟢 Approval recommended

The focused retry configuration directly addresses the confirmed transient Windows EBUSY cleanup failure.

Pull request overview

Adds resilient Windows cleanup for the session-state integration test.

Changes:

• Retries transient filesystem-lock failures for up to 5.5 seconds.
• Preserves immediate cleanup and persistent-error reporting.

File summaries

File	Description
Extension/test/scenarios/SingleRootProject/tests/buildAndDebug.test.ts	Adds retry options to temporary-directory removal.

Review details

• Files reviewed: 1/1 changed files
• Comments generated: 0
• Review effort level: Balanced

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