### 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)

return XCom.deserialize_value(first)
            query = query.order_by(None).order_by(XCom.map_index.asc())
            return LazyXComAccess.build_from_xcom_query(query)
        
        
        query = query.order_by(None)
        if task_ids is None or isinstance(task_ids, str):
            query = query.order_by(XCom.task_id)
        else:
            task_id_whens = {tid: i for i, tid in enumerate(task_ids)}
            if task_id_whens:
                query = query.order_by(case(task_id_whens, value=XCom.task_id))
            else:
                query = query.order_by(XCom.task_id)
        if map_indexes is None or isinstance(map_indexes, int):
            query = query.order_by(XCom.map_index)
        elif isinstance(map_indexes, range):
            order = XCom.map_index
            if map_indexes.step < 0:
                order = order.desc()
            query = query.order_by(order)
        else:
            map_index_whens = {map_index: i for i, map_index in enumerate(map_indexes)}
            if map_index_whens:
                query = query.order_by(case(map_index_whens, value=XCom.map_index))
            else:
                query = query.order_by(XCom.map_index)
        return LazyXComAccess.build_from_xcom_query(query)
    @provide_session
    def get_num_running_task_instances(self, session: Session, same_dagrun=False) -> int: