Support pushing and receiving updates to poll tallies (#10209)

* Process incoming poll tallies update

* Send Update on poll vote

* Do not send Updates for a poll more often than once every 3 minutes

* Include voters in people to notify of results update

* Schedule closing poll worker on poll creation

* Add new notification type for ending polls

* Add front-end support for ended poll notifications

* Fix UpdatePollSerializer

* Fix Updates not being triggered by local votes

* Fix tests failure

* Fix web push notifications for closing polls

* Minor cleanup

* Notify voters of both remote and local polls when those close

* Fix delivery of poll updates to mentioned accounts and voters

app/workers/poll_expiration_notify_worker.rb

@@ -0,0 +1,24 @@
+# frozen_string_literal: true
+
+class PollExpirationNotifyWorker
+  include Sidekiq::Worker
+
+  sidekiq_options unique: :until_executed
+
+  def perform(poll_id)
+    poll = Poll.find(poll_id)
+
+    # Notify poll owner and remote voters
+    if poll.local?
+      ActivityPub::DistributePollUpdateWorker.perform_async(poll.status.id)
+      NotifyService.new.call(poll.account, poll)
+    end
+
+    # Notify local voters
+    poll.votes.includes(:account).map(&:account).filter(&:local?).each do |account|
+      NotifyService.new.call(account, poll)
+    end
+  rescue ActiveRecord::RecordNotFound
+    true
+  end
+end