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
)
        dr2 = dag.create_dagrun(
            run_type=DagRunType.BACKFILL_JOB,
            state=State.RUNNING,
            execution_date=DEFAULT_DATE + datetime.timedelta(1),
            start_date=DEFAULT_DATE,
            session=session,
        )
        ti = dr.get_task_instance(task_id=op1.task_id, session=session)
        ti.state = State.SCHEDULED
        ti2 = dr2.get_task_instance(task_id=op1.task_id, session=session)
        ti2.state = State.SCHEDULED
        session.commit()
        processor = mock.MagicMock()
        scheduler = SchedulerJob(num_runs=0)
        scheduler.processor_agent = processor
        scheduler.adopt_or_reset_orphaned_tasks()
        ti = dr.get_task_instance(task_id=op1.task_id, session=session)
        assert ti.state == State.NONE
        ti2 = dr2.get_task_instance(task_id=op1.task_id, session=session)
        assert ti2.state == State.SCHEDULED, "Tasks run by Backfill Jobs should not be reset"
    @parameterized.expand(
        [
            [State.UP_FOR_RETRY, State.FAILED],
            [State.QUEUED, State.NONE],
            [State.SCHEDULED, State.NONE],
            [State.UP_FOR_RESCHEDULE, State.NONE],
        ]
    )
    def test_scheduler_loop_should_change_state_for_tis_without_dagrun(