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/models/test_taskinstance.py
dag.create_dagrun(
            execution_date=run_date,
            state=State.RUNNING,
            run_type=DagRunType.SCHEDULED,
        )
        ti = TI(task, run_date)
        
        task.run(start_date=run_date, end_date=run_date, ignore_first_depends_on_past=False)
        ti.refresh_from_db()
        assert ti.state is None
        
        task.run(start_date=run_date, end_date=run_date, ignore_first_depends_on_past=True)
        ti.refresh_from_db()
        assert ti.state == State.SUCCESS
    
    
    
    
    @parameterized.expand(
        [
            #
            
            #
            ['all_success', 5, 0, 0, 0, 0, True, None, True],
            ['all_success', 2, 0, 0, 0, 0, True, None, False],
            ['all_success', 2, 0, 1, 0, 0, True, State.UPSTREAM_FAILED, False],
            ['all_success', 2, 1, 0, 0, 0, True, State.SKIPPED, False],
            #
            
            #