[TASK] Add CI check for zero stray or non updated JavaScript files

All in-tree .js files have been migrated to TypeScript, so it's
time to add a CI check to ensure no stray build files (see #101786)
or non-updated JavaScript files (e.g. #101784, #101785, #101787)
are present in the git tree.

Resolves: #101783
Related: #101784
Related: #101785
Related: #101786
Related: #101787
Releases: main, 12.4
Change-Id: I02aeaaeaae7fa0df634f39cb151f4316240936ab
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/80869


Tested-by: Anja Leichsenring <aleichsenring@ab-softlab.de>
Tested-by: core-ci <typo3@b13.com>
Reviewed-by: Anja Leichsenring <aleichsenring@ab-softlab.de>