[PP-1] Provide basic tests

Postponed on 📌 Provide config schema Needs review .

Started working on this, but faced some issues.
First, remote_media tests aren't updated for D10.
When I fixed this locally for using MediaRemoteFunctionalJavascriptTestBase, got some random error when trying to save the form from media_library. Found out that actually media_library tests are skipped in core, which might be a cause. See 📌 Skip Drupal\Tests\ckeditor5\FunctionalJavascript\MediaLibraryTest Fixed .
Still need to figure out if we can fix that.

All green!

Test is passing, thanks!

Automatically closed - issue fixed for 2 weeks with no activity.