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/models/media_attachment.rb

@@ -185,7 +185,7 @@ class MediaAttachment < ApplicationRecord
   remotable_attachment :thumbnail, IMAGE_LIMIT, suppress_errors: true, download_on_assign: false
 
   validates :account, presence: true
-  validates :description, length: { maximum: MAX_DESCRIPTION_LENGTH }, if: :local?
+  validates :description, length: { maximum: MAX_DESCRIPTION_LENGTH }
   validates :file, presence: true, if: :local?
   validates :thumbnail, absence: true, if: -> { local? && !audio_or_video? }
 
@@ -258,7 +258,6 @@ class MediaAttachment < ApplicationRecord
   after_commit :enqueue_processing, on: :create
   after_commit :reset_parent_cache, on: :update
 
-  before_create :prepare_description, unless: :local?
   before_create :set_unknown_type
   before_create :set_processing
 
@@ -306,10 +305,6 @@ class MediaAttachment < ApplicationRecord
     self.type = :unknown if file.blank? && !type_changed?
   end
 
-  def prepare_description
-    self.description = description.strip[0...MAX_DESCRIPTION_LENGTH] unless description.nil?
-  end
-
   def set_type_and_extension
     self.type = begin
       if VIDEO_MIME_TYPES.include?(file_content_type)