Skip the 'TestAttachFailsWithoutWsl2Distro' test case if a WSL2 distro is installed

[OneBlue]

Summary of the Pull Request

This prevents test failures when running this test locally with a wsl2 distro installed

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 adjusts a Windows mount test to avoid failing in developer environments where any WSL2 distribution is already installed, by conditionally skipping the WSL1-only validation scenario.

Changes:

• Added a precondition to TestAttachFailsWithoutWsl2Distro that skips the test when any enumerated distro is not version 1 (i.e., a WSL2 distro is present).
• Minor formatting fix at the end-of-namespace closing line.