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

Conflicts:
- `app/lib/formatter.rb`:
  Upstream completely refactored the formatting code and removed that file,
  while glitch-soc had code for Markdown and HTML toots.
  Took upstream code, glitch-soc changes will be re-implemented on top of the
  refactored classes in a later commit.
- `app/models/status.rb`:
  Upstream refactored status edit handling and moved code to
  `app/models/concerns/status_snapshot_concern.rb`.
  Applied glitch-soc's changes to that file.
- `app/serializers/activitypub/note_serializer.rb`:
  Not really a conflict, just a line added too close to one modified by
  glitch-soc.
  Applied upstream changes while keeping the glitch-soc-modified one.
- `app/services/update_status_service.rb`:
  Not really a conflict, upstream modified a line adjacent to one added by
  glitch-soc.
  Applied upstream changes while keeping the glitch-soc line.
- `app/views/statuses/_simple_status.html.haml`:
  Upstream refactored formatting, glitch-soc changed the markup slightly.
  Applied upstream changes.
- `spec/lib/formatter_spec.rb`:
  Upstream completely refactored the formatting code and removed that file,
  while glitch-soc had code for Markdown and HTML toots.
  Took upstream code, glitch-soc changes will be re-implemented on top of the
  refactored classes in a later commit.

app/lib/feed_manager.rb

@@ -5,6 +5,7 @@ require 'singleton'
 class FeedManager
   include Singleton
   include Redisable
+  include FormattingHelper
 
   # Maximum number of items stored in a single feed
   MAX_ITEMS = 400
@@ -503,7 +504,7 @@ class FeedManager
     status         = status.reblog if status.reblog?
 
     combined_text = [
-      Formatter.instance.plaintext(status),
+      extract_plain_text(status.text, status.local?),
       status.spoiler_text,
       status.preloadable_poll ? status.preloadable_poll.options.join("\n\n") : nil,
       status.ordered_media_attachments.map(&:description).join("\n\n"),