Fix Undo Announce sometimes inlining the originally Announced status (#17516)

* Change tests to have more specific expectations on sent ActivityPub payloads

* Check that payload doesn't actually contain the contents of the boosted toot

* Fix Undo Announce sometimes inlining the originally Announced status

app/serializers/activitypub/undo_announce_serializer.rb

@@ -22,6 +22,6 @@ class ActivityPub::UndoAnnounceSerializer < ActivityPub::Serializer
   end
 
   def virtual_object
-    ActivityPub::ActivityPresenter.from_status(object)
+    ActivityPub::ActivityPresenter.from_status(object, allow_inlining: false)
   end
 end