Ensure that this works:

```python
@setup
def mytask():
    print("I am a setup task")

with dag_maker() as dag:
    mytask.override(task_id='newtask')

assert len(dag.task_group.children) == 1
setup_task = dag.task_group.children["newtask"]
assert setup_task._is_setup
```
and teardown also works
warnings.warn(
                f"Invalid arguments were passed to {self.__class__.__name__} (task_id: {task_id}). "
                "Support for passing such arguments will be dropped in future. "
                f"Invalid arguments were:\n**kwargs: {kwargs}",
                category=RemovedInAirflow3Warning,
                stacklevel=3,
            )
        validate_key(task_id)
        dag = dag or DagContext.get_current_dag()
        task_group = task_group or TaskGroupContext.get_current_task_group(dag)
        self.task_id = task_group.child_id(task_id) if task_group else task_id
        if not self.__from_mapped and task_group:
            task_group.add(self)
        self.owner = owner
        self.email = email
        self.email_on_retry = email_on_retry
        self.email_on_failure = email_on_failure
        if execution_timeout is not None and not isinstance(execution_timeout, timedelta):
            raise ValueError(
                f"execution_timeout must be timedelta object but passed as type: {type(execution_timeout)}"
            )
        self.execution_timeout = execution_timeout
        self.on_execute_callback = on_execute_callback
        self.on_failure_callback = on_failure_callback
        self.on_success_callback = on_success_callback
        self.on_retry_callback = on_retry_callback
        self._pre_execute_hook = pre_execute
        self._post_execute_hook = post_execute
        if start_date and not isinstance(start_date, datetime):
            self.log.warning("start_date for %s isn't datetime.datetime", self)