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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 -->


self.dataflow_hook = DataflowHook(
            gcp_conn_id=self.gcp_conn_id,
            poll_sleep=self.poll_sleep,
            impersonation_chain=self.impersonation_chain,
            cancel_timeout=self.stop_timeout,
            drain_pipeline=self.drain_pipeline,
        )
        if self.job_id or self.dataflow_hook.is_job_dataflow_running(
            name=self.job_name,
            project_id=self.project_id,
            location=self.location,
        ):
            self.dataflow_hook.cancel_job(
                job_name=self.job_name,
                project_id=self.project_id,
                location=self.location,
                job_id=self.job_id,
            )
        else:
            self.log.info("No jobs to stop")
        return None