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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 -->


account from the list granting this role to the originating account (templated).
    :param drain_pipeline: Optional, set to False if want to stop streaming job by canceling it
        instead of draining. See: https://cloud.google.com/dataflow/docs/guides/stopping-a-pipeline
    :param stop_timeout: wait time in seconds for successful job canceling/draining
    """
    def __init__(
        self,
        job_name_prefix: str | None = None,
        job_id: str | None = None,
        project_id: str | None = None,
        location: str = DEFAULT_DATAFLOW_LOCATION,
        gcp_conn_id: str = "google_cloud_default",
        poll_sleep: int = 10,
        impersonation_chain: str | Sequence[str] | None = None,
        stop_timeout: int | None = 10 * 60,
        drain_pipeline: bool = True,
        **kwargs,
    ) -> None:
        super().__init__(**kwargs)
        self.poll_sleep = poll_sleep
        self.stop_timeout = stop_timeout
        self.job_name = job_name_prefix
        self.job_id = job_id
        self.project_id = project_id
        self.location = location
        self.gcp_conn_id = gcp_conn_id
        self.impersonation_chain = impersonation_chain
        self.hook: DataflowHook | None = None
        self.drain_pipeline = drain_pipeline
    def execute(self, context: Context) -> None: