Check if the command is present before attempting to call WinGet

[Trenly]

• [x] I have signed the Contributor License Agreement.
• [ ] I have updated the Release Notes.
  • I assume this will go into 1.28(?), not 1.12, so waiting for the release branch to be created and #5787 to be merged before updating release notes
• [x] This pull request is related to an issue.
  • • #4005

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