### Description

expanding tasks in batches to allow mapped tasks spawn more than 1024 processes.

### Use case/motivation

Maximum length of a list is limited to 1024 by `max_map_length (AIRFLOW__CORE__MAX_MAP_LENGTH)`.
during scheduling of the new tasks, an UPDATE query is ran that tries to set all the new tasks at once.  Increasing `max_map_length` more than 4K makes airflow scheduler completely unresponsive.

Also, Postgres throws `stack depth limit exceeded` error which can be fixed by updating to a newer version and setting `max_stack_depth` higher. But it doesn't really matter because airflow scheduler freezes up.
 
As a workaround, I split the dag runs into subdag runs which works but it would be much nicer if we didn't have to worry about exceeding  `max_map_length`. 

### Related issues

It was discussed here:
[Increasing 'max_map_length' leads to SQL 'max_stack_depth' error with 5000 dags to be spawned #28478](https://github.com/apache/airflow/discussions/28478)

### Are you willing to submit a PR?

- [ ] Yes I am willing to submit a PR!

### Code of Conduct

- [X] I agree to follow this project's [Code of Conduct](https://github.com/apache/airflow/blob/main/CODE_OF_CONDUCT.md)

"""Given two operators, find their innermost common mapped task group."""
    if node1.dag is None or node2.dag is None or node1.dag_id != node2.dag_id:
        return None
    parent_group_ids = {g.group_id for g in node1.iter_mapped_task_groups()}
    common_groups = (g for g in node2.iter_mapped_task_groups() if g.group_id in parent_group_ids)
    return next(common_groups, None)
def _is_further_mapped_inside(operator: Operator, container: TaskGroup) -> bool:
    """Whether given operator is *further* mapped inside a task group."""
    if isinstance(operator, MappedOperator):
        return True
    task_group = operator.task_group
    while task_group is not None and task_group.group_id != container.group_id:
        if isinstance(task_group, MappedTaskGroup):
            return True
        task_group = task_group.parent_group
    return False
TaskInstanceStateType = Tuple[TaskInstanceKey, str]
class SimpleTaskInstance: