ci(coverity): fix Coverity scans #5266
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Starting in version 2024.12, the "cov-build" command is only supposed to be used for "build capture", while the "filesystem capture" used for non-compiled languages is only available via Coverity CLI (the "coverity" command).
The GH Action we use does not yet support that, so introduce a workaround by tricking the Action to run the correct command via command injection.
Tested in my fork: example run.
I've also explicitly limited the languages to Python and JS, as it was needlessly picking many documentation and other aux files. Let me know if you think this should be tweaked. That also removed the need for one of the exclude regexes.
Fixes #5254.