Add static check for overzealous .gitignores and fix an example of such. #78908
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This is a followup to #47212.
As part of my project setup, I decompress Godot into its own directory and copy the source across. This is kind of awkward to work with because Godot frequently has parts of its own repository ignored. I've got my scripts hooked up to work around this, but it keeps happening and I really think there should be a static check to solve it.
Enclosed is that static check, along with a fix for the latest example of the problem. If you'd like to see what the error looks like, check out https://github.com/zorbathut/godot/actions/runs/5431343555/jobs/9877648317 which was an intentional failure for testing - note that it also prints the file the ignore comes from. Github lists this process as taking zero seconds; in local testing, it's about 0.04 seconds.
I also tweaked a .gitignore to unignore a directory, though I'm not sure if that was the right solution.
I'm happy to make adjustments!