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
raise TypeError(f"Chain not supported between instances of {type(up_task)} and {type(down_task)}")
        up_task_list = up_task
        down_task_list = down_task
        if len(up_task_list) != len(down_task_list):
            raise AirflowException(
                f"Chain not supported for different length Iterable. "
                f"Got {len(up_task_list)} and {len(down_task_list)}."
            )
        for up_t, down_t in zip(up_task_list, down_task_list):
            up_t.set_downstream(down_t)
def cross_downstream(
    from_tasks: Sequence[DependencyMixin],
    to_tasks: DependencyMixin | Sequence[DependencyMixin],
):
    r"""
    Set downstream dependencies for all tasks in from_tasks to all tasks in to_tasks.
    Using classic operators/sensors:
    .. code-block:: python
        cross_downstream(from_tasks=[t1, t2, t3], to_tasks=[t4, t5, t6])
    is equivalent to::
        t1 ---> t4
           \ /
        t2 -X -> t5
           / \
        t3 ---> t6
    .. code-block:: python
        t1.set_downstream(t4)
        t1.set_downstream(t5)
        t1.set_downstream(t6)
        t2.set_downstream(t4)