Merge commit 'b1a584d252f4df4c2a1a9400d6588b4f36768216' into glitch-soc/merge-4.3

Conflicts:
- `app/lib/feed_manager.rb`:
  Not a real conflict, but glitch-soc has an extra `populate_direct_feed` method.
  Added upstream's code.
  In addition, upstream changed how notifications from follow subscriptions were
  handled, refactoring this file in the process.
  Ported upstream's changes.
- `app/services/precompute_feed_service.rb`:
  Not a real conflict, glitch-soc has extra code for the direct feed.
  Added upstream's new code for populating lists.
- `app/validators/poll_options_validator.rb`:
  Upstream split `PollValidator` in two, and glitch-soc had local changes to
  make the options configurable.
  Refactored as upstream did, keeping glitch-soc's configurable limits.
- `app/workers/feed_insert_worker.rb`:
  Upstream changed how notifications from follow subscriptions were handled,
  refactoring this file in the process.
  Conflict is due to glitch-soc having an extra timeline type (direct).
  Ported upstream's changes.

app/lib/activitypub/activity/create.rb

@@ -53,6 +53,7 @@ class ActivityPub::Activity::Create < ActivityPub::Activity
     ApplicationRecord.transaction do
       @status = Status.create!(@params)
       attach_tags(@status)
+      attach_mentions(@status)
     end
 
     resolve_thread(@status)
@@ -160,6 +161,15 @@ class ActivityPub::Activity::Create < ActivityPub::Activity
     # not a big deal
     Trends.tags.register(status)
 
+    # Update featured tags
+    return if @tags.empty? || !status.distributable?
+
+    @account.featured_tags.where(tag_id: @tags.pluck(:id)).find_each do |featured_tag|
+      featured_tag.increment(status.created_at)
+    end
+  end
+
+  def attach_mentions(status)
     @mentions.each do |mention|
       mention.status = status
       mention.save