Update the site settings admin view to allow filtering by the group as a select element

This is going to be quite simple once ✨ Continuation Add Views EntityReference filter to be available for all entity reference fields Active lands which we are getting close now. MR created to take advantage of that once it exists.

Per https://www.drupal.org/project/drupal/releases/10.3.0 → 10.4+ is now only supported, so we can use core views entity reference now

scott_euser → changed the visibility of the branch 3400025-group-filter to hidden.

Couldn't get it to work with Select for now without schema issues, but Autocomplete better than status quo so going to merge. Test coverage added.

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