Ability to flag/clean lines that don't match code in the codebase anymore

[mwachs5]

Is your feature request related to a problem?

If I have a useful entry in my CODEOWNERS file like:

/my/old/library @mwachs5

and then later I delete the directory, or rename it to

/my/new/library

There is nothing that flags the line as being 'dead' now. Since there is a limit to the size of the CODEOWNERS file, this could become a problem.

Describe the solution you'd like

This cleaning action could delete the dead lines.

I'd prefer to make that decoupled from the deletion of invalid users, since in our organization we'd prefer to have control over reassignment when we realize that the file has become outdated.

Describe alternatives you've considered

• The way GitHub currently reports if the user is no longer present at the organization, thereby makign the CODEOWNERS file invalid, is fine. Though, it seems like since it is actually changes to the codebase (because files are handled by the repo) this could be done more synchronously with changes to the codebase.
• a button one could click on the GUI for 'tell me whether this CODEOWNERS file meets certain criteria'
• C/I check that prohibits invalidating changes to the CODEOWNERS file

Additional context

No response

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This issue was closed because it has been stalled for 35 days with no activity.