Add the update_user_directory_from_worker configuration option (superseding update_user_directory) to allow a generic worker to be designated as the worker to update the user directory. (#12654)

Co-authored-by: Shay <hillerys@element.io>

synapse/app/admin_cmd.py

@@ -210,7 +210,7 @@ def start(config_options: List[str]) -> None:
         config.logging.no_redirect_stdio = True
 
     # Explicitly disable background processes
-    config.server.update_user_directory = False
+    config.worker.should_update_user_directory = False
     config.worker.run_background_tasks = False
     config.worker.start_pushers = False
     config.worker.pusher_shard_config.instances = []