### Summary

The units in `test/units/plugins/strategy/test_strategy.py` have become problematic, and fail randomly due to something in the test not properly tearing down ansible.  Eventually the tests are killed in CI, and most frequently on python3.5.

See https://github.com/ansible/ansible/pull/74048

### Issue Type

Bug Report

### Component Name

test/units/plugins/strategy/test_strategy.py

### Ansible Version

```console (paste below)
$ ansible --version
2.11
```


### Configuration

```console (paste below)
$ ansible-config dump --only-changed

```


### OS / Environment

default test container, frequently with Py3.5 in CI

### Steps to Reproduce

<!--- Paste example playbooks or commands between quotes below -->
```yaml (paste below)

```


### Expected Results

No hang in CI

### Actual Results

Transient hangs in CI

strategy_base._loader = fake_loader
        strategy_base.cleanup()
        mock_play = MagicMock()
        mock_block = MagicMock()
        mock_block._play = mock_play
        mock_block.vars = dict()
        mock_task = MagicMock()
        mock_task._block = mock_block
        mock_task._role = None
        
        
        
        
        mock_task._parent = MagicMock()
        mock_task.copy.return_value = mock_task
        mock_task.build_parent_block.return_value = mock_block
        mock_block._get_parent_attribute.return_value = None
        mock_iterator = MagicMock()
        mock_iterator.mark_host_failed.return_value = None
        mock_inc_file = MagicMock()
        mock_inc_file._task = mock_task
        mock_inc_file._filename = "test.yml"
        res = strategy_base._load_included_file(included_file=mock_inc_file, iterator=mock_iterator)
        self.assertEqual(len(res), 1)
        self.assertTrue(isinstance(res[0], Block))
        mock_inc_file._filename = "bad.yml"
        res = strategy_base._load_included_file(included_file=mock_inc_file, iterator=mock_iterator)
        self.assertEqual(res, [])
    @patch.object(WorkerProcess, 'run')
    def test_strategy_base_run_handlers(self, mock_worker):