[FileLocksmith]Fix crash while opening process handlers

[jaimecbernardo]

Summary of the Pull Request

Fix crashes that were occurring when a process exited after we recognized it but before we added a watcher to check when it exited.

PR Checklist

• Closes: File in use - who has my file locked? #114
• Communication: I've discussed this with core contributors already. If work hasn't been agreed, this work might be rejected
• Tests: Added/updated and all pass
• Localization: All end user facing strings can be localized
• Dev docs: Added/updated
• New binaries: Added on the required places
  • JSON for signing for new binaries
  • WXS for installer for new binaries and localization folder
  • YML for CI pipeline for new test projects
  • YML for signed pipeline
• 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

Actually handle exceptions when getting the process handles and log them.
Remove the DataBinding on IsExpanded. It's not working and is filling the logs with useless information.

Validation Steps Performed

Tested on PCs where the crash was easily reproducible.

[stefansjfw]

I couldn't reproduce the crash before, but change looks good to me.

[SeraphimaZykova]

Tested, the issue is fixed!

[jaimecbernardo]

This solves: #21583