Merge branch 'main' into glitch-soc/merge-upstream

Conflicts:
- `app/lib/activitypub/activity/create.rb`:
  Upstream refactored how `Create` activities are handled and how values are
  extracted from `Create`d objects. This conflicted with how glitch-soc
  supported the `directMessage` flag to explicitly distinguish between
  limited and direct messages.
  Ported glitch-soc's changes to latest upstream changes.
- `app/services/fan_out_on_write_service.rb`:
  Upstream largely refactored that file and changed some of the logic.
  This conflicted with glitch-soc's handling of the direct timeline and
  the options to allow replies and boosts in public feeds.
  Ported those glitch-soc changes on top of latest upstream changes.
- `app/services/process_mentions_service.rb`:
  Upstream refactored to move mention-related ActivityPub deliveries to
  `ActivityPub::DeliveryWorker`, while glitch-soc contained an extra check
  to not send local-only toots to remote mentioned users.
  Took upstream's version, as the check is not needed anymore, since it is
  performed at the `ActivityPub::DeliveryWorker` call site already.
- `app/workers/feed_insert_worker.rb`:
  Upstream added support for `update` toot events, while glitch-soc had
  support for an extra timeline support, `direct`.
  Ported upstream changes and extended them to the `direct` timeline.

Additional changes:
- `app/lib/activitypub/parser/status_parser.rb`:
  Added code to handle the `directMessage` flag and take it into account
  to compute visibility.
- `app/lib/feed_manager.rb`:
  Extended upstream's support of `update` toot events to glitch-soc's
  `direct` timeline.

app/serializers/activitypub/note_serializer.rb

@@ -11,6 +11,7 @@ class ActivityPub::NoteSerializer < ActivityPub::Serializer
 
   attribute :content
   attribute :content_map, if: :language?
+  attribute :updated, if: :edited?
 
   attribute :direct_message, if: :non_public?
 
@@ -76,6 +77,8 @@ class ActivityPub::NoteSerializer < ActivityPub::Serializer
     object.language.present?
   end
 
+  delegate :edited?, to: :object
+
   def in_reply_to
     return unless object.reply? && !object.thread.nil?
 
@@ -90,6 +93,10 @@ class ActivityPub::NoteSerializer < ActivityPub::Serializer
     object.created_at.iso8601
   end
 
+  def updated
+    object.edited_at.iso8601
+  end
+
   def url
     ActivityPub::TagManager.instance.url_for(object)
   end