**Apache Airflow version**:

1.10.12

**What happened**:

I created dag with dagrun_timeout=2 minutes. 

After 2 minutes dagrun is marked as failed and the next one is started, but task keeps going.

**What you expected to happen**:

Task is killed with dag run as it is done when you mark dagrun failed manually.

**How to reproduce it**:
```
dag = DAG(dag_id='platform.airflow-test',
          description='',
          schedule_interval="0 0 * * *",
          start_date=datetime(2020, 7, 1),
          max_active_runs=1,
          catchup=True,
          dagrun_timeout=timedelta(minutes=2))

run_this = BashOperator(
    task_id='run_after_loop',
    bash_command=' for((i=1;i<=600;i+=1)); do echo "Welcome $i times"; sleep 1;  done',
    dag=dag,
)
```
airflow/jobs/scheduler_job.py
try:
            
            with redirect_stdout(StreamLogWriter(log, logging.INFO)), redirect_stderr(
                StreamLogWriter(log, logging.WARN)
            ), Stats.timer() as timer:
                
                settings.configure_orm()
                
                
                
                threading.current_thread().name = thread_name
                log.info("Started process (PID=%s) to work on %s", os.getpid(), file_path)
                dag_file_processor = DagFileProcessor(dag_ids=dag_ids, log=log)
                result: Tuple[int, int] = dag_file_processor.process_file(
                    file_path=file_path,
                    pickle_dags=pickle_dags,
                    callback_requests=callback_requests,
                )
                result_channel.send(result)
            log.info("Processing %s took %.3f seconds", file_path, timer.duration)
        except Exception:  
            
            log.exception("Got an exception! Propagating...")
            raise
        finally:
            
            
            settings.dispose_orm()
            result_channel.close()
    def start(self) -> None: