Stop adding specific CSS to Media form and use ContentEntityForm regions instead

This issue is being reviewed by the kind folks in Slack, #needs-review-queue-initiative. We are working to keep the size of Needs Review queue [2700+ issues] to around 400 (1 month or less), following Review a patch or merge request → as a guide.

So looking at the IS and comments this appears to be specific to seven to me? Which was removed in D10

If you disagree please move back with an updated issue summary

Thanks

Patch in #12 only changes a Drupal core file, while the patch in #2 also changes some of this theme's files. The latter can be used for the merge request.