### Body

The `test_no_orphan_process_will_be_left` in `TestSchedulerJob` is really flaky.

Before we know how to fix it, I will quarantine it:

https://github.com/apache/airflow/pull/18691/checks?check_run_id=3811660138

```
  =================================== FAILURES ===================================
  _____________ TestSchedulerJob.test_no_orphan_process_will_be_left _____________
  
  self = <tests.jobs.test_scheduler_job.TestSchedulerJob object at 0x7fc2f91d2ac8>
  
      def test_no_orphan_process_will_be_left(self):
          empty_dir = mkdtemp()
          current_process = psutil.Process()
          old_children = current_process.children(recursive=True)
          self.scheduler_job = SchedulerJob(
              subdir=empty_dir, num_runs=1, executor=MockExecutor(do_update=False)
          )
          self.scheduler_job.run()
          shutil.rmtree(empty_dir)
      
          # Remove potential noise created by previous tests.
          current_children = set(current_process.children(recursive=True)) - set(old_children)
  >       assert not current_children
  E       AssertionError: assert not {psutil.Process(pid=2895, name='pytest', status='running', started='06:53:45')}
  
```

### Committer

- [X] I acknowledge that I am a maintainer/committer of the Apache Airflow project.
tests/jobs/test_scheduler_job.py
"""Ensure orphaned tasks with non-running dagruns are not reset."""
        dag_id = 'test_reset_orphaned_tasks_non_running_dagruns'
        with dag_maker(dag_id=dag_id, schedule_interval='@daily'):
            task_id = dag_id + '_task'
            DummyOperator(task_id=task_id)
        self.scheduler_job = SchedulerJob(subdir=os.devnull)
        session = settings.Session()
        session.add(self.scheduler_job)
        session.flush()
        dr1 = dag_maker.create_dagrun()
        tis = dr1.get_task_instances(session=session)
        assert 1 == len(tis)
        tis[0].state = State.SCHEDULED
        tis[0].queued_by_job_id = self.scheduler_job.id
        session.merge(dr1)
        session.merge(tis[0])
        session.flush()
        assert 0 == self.scheduler_job.adopt_or_reset_orphaned_tasks(session=session)
        session.rollback()
    def test_adopt_or_reset_orphaned_tasks_stale_scheduler_jobs(self, dag_maker):
        dag_id = 'test_adopt_or_reset_orphaned_tasks_stale_scheduler_jobs'
        with dag_maker(dag_id=dag_id, schedule_interval='@daily'):
            DummyOperator(task_id='task1')
            DummyOperator(task_id='task2')
        self.scheduler_job = SchedulerJob(subdir=os.devnull)
        session = settings.Session()
        self.scheduler_job.state = State.RUNNING
        self.scheduler_job.latest_heartbeat = timezone.utcnow()
        session.add(self.scheduler_job)