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**Description**

Related to the discussion here: https://github.com/apache/airflow/pull/8553#discussion_r416136954

Allow user to define expected terminal state. e.g. `JOB_STATE_CANCELLED` could be not treated as failure but expected terminal state.


<!-- A short description of your feature -->


variables: dict | None = None,
    ) -> bool:
        """
        Helper method to check if jos is still running in dataflow.
        :param name: The name of the job.
        :param project_id: Optional, the Google Cloud project ID in which to start a job.
            If set to None or missing, the default project_id from the Google Cloud connection is used.
        :param location: Job location.
        :return: True if job is running.
        """
        if variables:
            warnings.warn(
                "The variables parameter has been deprecated. You should pass location using "
                "the location parameter.",
                AirflowProviderDeprecationWarning,
                stacklevel=4,
            )
        jobs_controller = _DataflowJobsController(
            dataflow=self.get_conn(),
            project_number=project_id,
            name=name,
            location=location,
            poll_sleep=self.poll_sleep,
            drain_pipeline=self.drain_pipeline,
            num_retries=self.num_retries,
            cancel_timeout=self.cancel_timeout,
        )
        return jobs_controller.is_job_running()
    @GoogleBaseHook.fallback_to_default_project_id
    def cancel_job(