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>

spec/services/batched_remove_status_service_spec.rb

@@ -43,10 +43,6 @@ RSpec.describe BatchedRemoveStatusService, type: :service do
     expect(Redis.current).to have_received(:publish).with("timeline:#{jeff.id}", any_args).at_least(:once)
   end
 
-  it 'notifies streaming API of author' do
-    expect(Redis.current).to have_received(:publish).with("timeline:#{alice.id}", any_args).at_least(:once)
-  end
-
   it 'notifies streaming API of public timeline' do
     expect(Redis.current).to have_received(:publish).with('timeline:public', any_args).at_least(:once)
   end