Fixes/do not override timestamps (#7331)

* Do not override timestamps for incoming toots

* Remove every reference to override_timestamps

Statuses are now created with the announced publishing date
and are only pushed to timelines if that date is at most
6 hours earlier than the time at which it is processed.

app/lib/activitypub/activity.rb

@@ -80,7 +80,7 @@ class ActivityPub::Activity
 
     # Only continue if the status is supposed to have
     # arrived in real-time
-    return unless @options[:override_timestamps] || status.within_realtime_window?
+    return unless status.within_realtime_window?
 
     distribute_to_followers(status)
   end