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
continue
                if upstream:
                    self.upstream_task_ids.add(task.node_id)
                    if edge_modifier:
                        edge_modifier.add_edge_info(self.dag, task.node_id, self.upstream_join_id)
                else:
                    self.downstream_task_ids.add(task.node_id)
                    if edge_modifier:
                        edge_modifier.add_edge_info(self.dag, self.downstream_join_id, task.node_id)
    def _set_relatives(
        self,
        task_or_task_list: DependencyMixin | Sequence[DependencyMixin],
        upstream: bool = False,
        edge_modifier: EdgeModifier | None = None,
    ) -> None:
        """
        Call set_upstream/set_downstream for all root/leaf tasks within this TaskGroup.
        Update upstream_group_ids/downstream_group_ids/upstream_task_ids/downstream_task_ids.
        """
        if not isinstance(task_or_task_list, Sequence):
            task_or_task_list = [task_or_task_list]
        for task_like in task_or_task_list:
            self.update_relative(task_like, upstream, edge_modifier=edge_modifier)
        if upstream:
            for task in self.get_roots():
                task.set_upstream(task_or_task_list)
        else:
            for task in self.get_leaves():
                task.set_downstream(task_or_task_list)
    def __enter__(self) -> TaskGroup: