test: update public flow settings stub

Author: erichare

src/backend/tests/unit/test_redis_job_queue_service.py

@@ -2589,6 +2589,9 @@ async def _fake_session_scope():
             yield _FakeSession()
 
         class _FakeSettingsService:
+            class settings:  # noqa: N801
+                rate_limit_enabled = False
+
             class auth_settings:  # noqa: N801
                 AUTO_LOGIN = True