Moving the test to quarantine. (#11405)

I've seen the test being flaky and failing intermittently several times.

Moving it to quarantine for now.

tests/jobs/test_scheduler_job.py

@@ -3547,6 +3547,7 @@ class TestSchedulerJobQueriesCount(unittest.TestCase):
         clear_db_serialized_dags()
         clear_db_dags()
 
+    @pytest.mark.quarantined
     @parameterized.expand(
         [
             # pylint: disable=bad-whitespace