### 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)

self,
        state: DagRunState | None = None,
        session: Session | None = None,
    ) -> DagRun | None:
        """The DagRun that ran before this task instance's DagRun.
        :param state: If passed, it only take into account instances of a specific state.
        :param session: SQLAlchemy ORM Session.
        """
        dag = self.task.dag
        if dag is None:
            return None
        dr = self.get_dagrun(session=session)
        dr.dag = dag
        
        
        
        
        ignore_schedule = state is not None or not dag.timetable.can_run
        if dag.catchup is True and not ignore_schedule:
            last_dagrun = dr.get_previous_scheduled_dagrun(session=session)
        else:
            last_dagrun = dr.get_previous_dagrun(session=session, state=state)
        if last_dagrun:
            return last_dagrun
        return None
    @provide_session
    def get_previous_ti(