### 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)

pass  
                elif self.state != State.RUNNING and not dag.partial:
                    self.log.warning("Failed to get task '%s' for dag '%s'. Marking it as removed.", ti, dag)
                    Stats.incr(f"task_removed_from_dag.{dag.dag_id}", tags=self.stats_tags)
                    ti.state = State.REMOVED
                continue
            try:
                num_mapped_tis = task.get_parse_time_mapped_ti_count()
            except NotMapped:
                continue
            except NotFullyPopulated:
                
                try:
                    total_length = task.get_mapped_ti_count(self.run_id, session=session)
                except NotFullyPopulated:
                    
                    if ti.map_index >= 0:
                        self.log.debug(
                            "Removing the unmapped TI '%s' as the mapping can't be resolved yet", ti
                        )
                        ti.state = State.REMOVED
                    continue
                
                if ti.map_index >= total_length:
                    self.log.debug(
                        "Removing task '%s' as the map_index is longer than the resolved mapping list (%d)",
                        ti,
                        total_length,
                    )
                    ti.state = State.REMOVED