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
- {
                    "upstream_task_ids",
                    "default_args",
                    "dag",
                    "_dag",
                    "label",
                    "_BaseOperator__instantiated",
                    "_BaseOperator__init_kwargs",
                    "_BaseOperator__from_mapped",
                }
                | {  
                    "start_date",
                    "end_date",
                    "_task_type",
                    "_operator_name",
                    "subdag",
                    "ui_color",
                    "ui_fgcolor",
                    "template_ext",
                    "template_fields",
                    "template_fields_renderers",
                    "params",
                    "_is_setup",
                    "_is_teardown",
                    "_on_failure_fail_dagrun",
                }
            )
            DagContext.pop_context_managed_dag()
        return cls.__serialized_fields
    def serialize_for_task_group(self) -> tuple[DagAttributeTypes, Any]: