Improve account deletion performances further (#15407)

* Delete status records by batches of 50

* Do not precompute values that are only used once

* Do not generate redis events for removal of public toots older than two weeks

* Filter reported toots a priori for polls and status deletion

* Do not process reblogs when cleaning up public timelines

As in Mastodon proper, reblogs don't appear in public TLs

* Clean the deleted account's own feed in one go

* Refactor Account#clean_feed_manager and List#clean_feed_manager

* Delete instead of destroy a few more associations

* Fix preloading

Co-authored-by: Claire <claire.github-309c@sitedethib.com>

app/workers/scheduler/feed_cleanup_scheduler.rb

@@ -14,37 +14,11 @@ class Scheduler::FeedCleanupScheduler
   private
 
   def clean_home_feeds!
-    clean_feeds!(inactive_account_ids, :home)
+    feed_manager.clean_feeds!(:home, inactive_account_ids)
   end
 
   def clean_list_feeds!
-    clean_feeds!(inactive_list_ids, :list)
-  end
-
-  def clean_feeds!(ids, type)
-    reblogged_id_sets = {}
-
-    redis.pipelined do
-      ids.each do |feed_id|
-        redis.del(feed_manager.key(type, feed_id))
-        reblog_key = feed_manager.key(type, feed_id, 'reblogs')
-        # We collect a future for this: we don't block while getting
-        # it, but we can iterate over it later.
-        reblogged_id_sets[feed_id] = redis.zrange(reblog_key, 0, -1)
-        redis.del(reblog_key)
-      end
-    end
-
-    # Remove all of the reblog tracking keys we just removed the
-    # references to.
-    redis.pipelined do
-      reblogged_id_sets.each do |feed_id, future|
-        future.value.each do |reblogged_id|
-          reblog_set_key = feed_manager.key(type, feed_id, "reblogs:#{reblogged_id}")
-          redis.del(reblog_set_key)
-        end
-      end
-    end
+    feed_manager.clean_feeds!(:list, inactive_list_ids)
   end
 
   def inactive_account_ids