Move the test_process_dags_queries_count test to quarantine (#11455)

The test (test_process_dags_queries_count)
randomly produces bigger number of counts. Example here:

https://github.com/apache/airflow/runs/1239572585#step:6:421

tests/jobs/test_scheduler_job.py

@@ -3639,6 +3639,7 @@ class TestSchedulerJobQueriesCount(unittest.TestCase):
             # pylint: enable=bad-whitespace
         ]
     )
+    @pytest.mark.quarantined
     def test_process_dags_queries_count(
         self, expected_query_counts, dag_count, task_count, start_ago, schedule_interval, shape
     ):