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
"""Required by TaskMixin"""
        return list(self.get_leaves())
    def get_roots(self) -> Generator[BaseOperator, None, None]:
        """
        Returns a generator of tasks that are root tasks, i.e. those with no upstream
        dependencies within the TaskGroup.
        """
        for task in self:
            if not any(self.has_task(parent) for parent in task.get_direct_relatives(upstream=True)):
                yield task
    def get_leaves(self) -> Generator[BaseOperator, None, None]:
        """
        Returns a generator of tasks that are leaf tasks, i.e. those with no downstream
        dependencies within the TaskGroup
        """
        for task in self:
            if not any(self.has_task(child) for child in task.get_direct_relatives(upstream=False)):
                yield task
    def child_id(self, label):
        """
        Prefix label with group_id if prefix_group_id is True. Otherwise return the label
        as-is.
        """
        if self.prefix_group_id and self.group_id:
            return f"{self.group_id}.{label}"
        return label
    @property
    def upstream_join_id(self) -> str: