### 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
dep_context=DepContext(ignore_depends_on_past=False),
                    session=session,
                    verbose=self.verbose,
                )
                != t.are_dependencies_met(
                    dep_context=DepContext(ignore_depends_on_past=True), session=session, verbose=self.verbose
                )
                for t in ti_status.deadlocked
            )
            if deadlocked_depends_on_past:
                err += (
                    'Some of the deadlocked tasks were unable to run because '
                    'of "depends_on_past" relationships. Try running the '
                    'backfill with the option '
                    '"ignore_first_depends_on_past=True" or passing "-I" at '
                    'the command line.'
                )
            err += '\nThese tasks have succeeded:\n'
            err += tabulate_ti_keys_set(ti_status.succeeded)
            err += '\n\nThese tasks are running:\n'
            err += tabulate_ti_keys_set(ti_status.running)
            err += '\n\nThese tasks have failed:\n'
            err += tabulate_ti_keys_set(ti_status.failed)
            err += '\n\nThese tasks are skipped:\n'
            err += tabulate_ti_keys_set(ti_status.skipped)
            err += '\n\nThese tasks are deadlocked:\n'
            err += tabulate_tis_set(ti_status.deadlocked)
        return err
    @provide_session
    def _execute_dagruns(self, dagrun_infos, ti_status, executor, pickle_id, start_date, session=None):