Apply parent dag permissions to subdags. - #18160

    def can_read_dag(self, dag_id, user=None) -> bool:
        """Determines whether a user has DAG read access."""
        if not user:
            user = g.user

        # To account for SubDags
        root_dag_id = dag_id.split(".")[0]
        dag_resource_name = permissions.resource_name_for_dag(root_dag_id)
        return self._has_access(
            user, permissions.ACTION_CAN_READ, permissions.RESOURCE_DAG
        ) or self._has_access(user, permissions.ACTION_CAN_READ, dag_resource_name)

    def can_edit_dag(self, dag_id, user=None) -> bool:
        """Determines whether a user has DAG edit access."""
        if not user:
            user = g.user
        # To account for SubDags
        root_dag_id = dag_id.split(".")[0]
        dag_resource_name = permissions.resource_name_for_dag(root_dag_id)

        return self._has_access(
            user, permissions.ACTION_CAN_EDIT, permissions.RESOURCE_DAG
        ) or self._has_access(user, permissions.ACTION_CAN_EDIT, dag_resource_name)