**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
"""Kill the process launched to process the file, and ensure consistent state."""
        if self._process is None:
            raise AirflowException("Tried to kill before starting!")
        self._kill_process()
    def terminate(self, sigkill: bool = False) -> None:
        """
        Terminate (and then kill) the process launched to process the file.
        :param sigkill: whether to issue a SIGKILL if SIGTERM doesn't work.
        :type sigkill: bool
        """
        if self._process is None or self._parent_channel is None:
            raise AirflowException("Tried to call terminate before starting!")
        self._process.terminate()
        
        with suppress(TimeoutError):
            self._process._popen.wait(5)  
        if sigkill:
            self._kill_process()
        self._parent_channel.close()
    def _kill_process(self) -> None: