This tests fails occasionally on mysql at least:

https://github.com/apache/airflow/pull/11555/checks?check_run_id=1260840314#step:9:1125

```
=================================== FAILURES ===================================
_____________ TestSchedulerJob.test_no_orphan_process_will_be_left _____________

self = <tests.jobs.test_scheduler_job.TestSchedulerJob testMethod=test_no_orphan_process_will_be_left>

    def test_no_orphan_process_will_be_left(self):
        empty_dir = mkdtemp()
        current_process = psutil.Process()
        old_children = current_process.children(recursive=True)
        scheduler = SchedulerJob(subdir=empty_dir,
                                 num_runs=1,
                                 executor=MockExecutor(do_update=False))
        scheduler.run()
        shutil.rmtree(empty_dir)
    
        # Remove potential noise created by previous tests.
        current_children = set(current_process.children(recursive=True)) - set(
            old_children)
>       self.assertFalse(current_children)
E       AssertionError: {psutil.Process(pid=3474, name='/usr/local/bin/', status='running', started='19:26:22')} is not false

tests/jobs/test_scheduler_job.py:871: AssertionError
```



tests/jobs/test_scheduler_job.py
try:
                ti.run(ignore_ti_state=ignore_ti_state)
            except AirflowException:
                pass
        assert ti.try_number == 1
        
        
        
        
        
        run_with_error(ti, ignore_ti_state=True)
        assert ti.state == State.UP_FOR_RETRY
        assert ti.try_number == 2
        with create_session() as session:
            ti.refresh_from_db(lock_for_update=True, session=session)
            ti.state = State.SCHEDULED
            session.merge(ti)
        
        executor.do_update = True
        do_schedule()  
        ti.refresh_from_db()
        assert ti.state == State.SUCCESS
    @pytest.mark.quarantined
    def test_retry_handling_job(self):