Add endpoints for backfilling history (MSC2716) (#9247)

Work on https://github.com/matrix-org/matrix-doc/pull/2716

tests/replication/test_federation_sender_shard.py

@@ -224,7 +224,9 @@ class FederationSenderTestCase(BaseMultiWorkerStreamTestCase):
         }
 
         builder = factory.for_room_version(room_version, event_dict)
-        join_event = self.get_success(builder.build(prev_event_ids, None))
+        join_event = self.get_success(
+            builder.build(prev_event_ids=prev_event_ids, auth_event_ids=None)
+        )
 
         self.get_success(federation.on_send_join_request(remote_server, join_event))
         self.replicate()