Merge commit 'b2388be71eb0031ef9e47c492b1c038231cd8bc0' into glitch-soc/merge-upstream

Conflicts:
- `app/controllers/activitypub/collections_controller.rb`:
  Upstream renamed a helper method everywhere.
  There was one glitch-soc line involving changes because of the local-only post
  feature.
  Ported upstream's change.

app/controllers/application_controller.rb

@@ -9,6 +9,7 @@ class ApplicationController < ActionController::Base
   include UserTrackingConcern
   include SessionTrackingConcern
   include CacheConcern
+  include PreloadingConcern
   include DomainControlHelper
   include ThemingConcern
   include DatabaseHelper