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
done=done,
            flag_upstream_failed=flag_upstream_failed,
        )
        completed = all(dep.passed for dep in dep_results)
        assert completed == expect_completed
        assert ti.state == expect_state
    def test_respects_prev_dagrun_dep(self):
        with DAG(dag_id='test_dag'):
            task = DummyOperator(task_id='task', start_date=DEFAULT_DATE)
        ti = TI(task, DEFAULT_DATE)
        failing_status = [TIDepStatus('test fail status name', False, 'test fail reason')]
        passing_status = [TIDepStatus('test pass status name', True, 'test passing reason')]
        with patch(
            'airflow.ti_deps.deps.prev_dagrun_dep.PrevDagrunDep.get_dep_statuses', return_value=failing_status
        ):
            assert not ti.are_dependencies_met()
        with patch(
            'airflow.ti_deps.deps.prev_dagrun_dep.PrevDagrunDep.get_dep_statuses', return_value=passing_status
        ):
            assert ti.are_dependencies_met()
    @parameterized.expand(
        [
            (State.SUCCESS, True),
            (State.SKIPPED, True),
            (State.RUNNING, False),
            (State.FAILED, False),
            (State.NONE, False),
        ]
    )
    def test_are_dependents_done(self, downstream_ti_state, expected_are_dependents_done):