Add Known issues links to File Locksmith docs

[AMDphreak]

Summary

• Add a Known issues section to the File Locksmith utility page, matching other PowerToys utility docs (for example PowerToys Run and Keyboard Manager).
• Link to open issues labeled Product-File Locksmith for existing conversations, and to the PowerToys bug report form for new reports.

Test plan

• Preview the rendered page and confirm both links resolve
• Confirm the issues filter shows File Locksmith-labeled items

Made with Cursor

[prmerger-automator]

@AMDphreak : Thanks for your contribution! The author(s) and reviewer(s) have been notified to review your proposed change.

[prmerger-automator]

@AMDphreak : Thanks for your contribution! The author(s) and reviewer(s) have been notified to review your proposed change.

[learn-build-service-prod]

Learn Build status updates of commit 3622f1e:

✅ Validation status: passed

File	Status	Preview URL	Details
hub/powertoys/file-locksmith.md	✅Succeeded

For more details, please refer to the build report.