Retry to delete WSL distribution shortcut for up to 10 seconds

[Blue (OneBlue)]

Summary of the Pull Request

This change updates the shortcut deletion logic to retry for up to 10 seconds.

We've seen test failures where the shortcut failed to delete with ERROR_SHARING_VIOLATION. Retrying for a small amount of time should solve the issue and stabilize the tests

PR Checklist

• Closes: Link to issue #xxx
• Communication: I've discussed this with core contributors already. If work hasn't been agreed, this work might be rejected
• Tests: Added/updated if needed and all pass
• Localization: All end user facing strings can be localized
• Dev docs: Added/updated if needed
• Documentation updated: If checked, please file a pull request on our docs repo and link it here: #xxx

Detailed Description of the Pull Request / Additional comments

Validation Steps Performed

[Copilot]

Pull request overview

This PR improves robustness of WSL distribution uninstall cleanup by adding retry logic when deleting the Start Menu shortcut, addressing intermittent test failures caused by transient ERROR_SHARING_VIOLATION file locks.

Changes:

• Replace single-attempt shortcut deletion with wsl::shared::retry::RetryWithTimeout (100ms interval, 10s timeout) gated to retry only on ERROR_SHARING_VIOLATION.
• Preserve best-effort behavior by catching/logging failures after retries rather than failing distribution deletion.