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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,
        gcp_conn_id: str = "google_cloud_default",
        poll_sleep: int = 10,
        impersonation_chain: str | Sequence[str] | None = None,
        drain_pipeline: bool = False,
        cancel_timeout: int | None = 5 * 60,
        wait_until_finished: bool | None = None,
        **kwargs,
    ) -> None:
        if kwargs.get("delegate_to") is not None:
            raise RuntimeError(
                "The `delegate_to` parameter has been deprecated before and finally removed in this version"
                " of Google Provider. You MUST convert it to `impersonate_chain`"
            )
        self.poll_sleep = poll_sleep
        self.drain_pipeline = drain_pipeline
        self.cancel_timeout = cancel_timeout
        self.wait_until_finished = wait_until_finished
        self.job_id: str | None = None
        self.beam_hook = BeamHook(BeamRunnerType.DataflowRunner)
        super().__init__(
            gcp_conn_id=gcp_conn_id,
            impersonation_chain=impersonation_chain,
        )
    def get_conn(self) -> build: