### Body

Add unit test for changes in https://github.com/apache/airflow/pull/17305

### Committer

- [X] I acknowledge that I am a maintainer/committer of the Apache Airflow project.
airflow/jobs/backfill_job.py
delay_on_limit_secs=1.0,
        verbose=False,
        conf=None,
        rerun_failed_tasks=False,
        run_backwards=False,
        run_at_least_once=False,
        *args,
        **kwargs,
    ):
        """
        :param dag: DAG object.
        :type dag: airflow.models.DAG
        :param start_date: start date for the backfill date range.
        :type start_date: datetime.datetime
        :param end_date: end date for the backfill date range.
        :type end_date: datetime.datetime
        :param mark_success: flag whether to mark the task auto success.
        :type mark_success: bool
        :param donot_pickle: whether pickle
        :type donot_pickle: bool
        :param ignore_first_depends_on_past: whether to ignore depend on past
        :type ignore_first_depends_on_past: bool
        :param ignore_task_deps: whether to ignore the task dependency
        :type ignore_task_deps: bool
        :param pool: pool to backfill
        :type pool: str
        :param delay_on_limit_secs:
        :param verbose:
        :type verbose: flag to whether display verbose message to backfill console
        :param conf: a dictionary which user could pass k-v pairs for backfill