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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 -->


"""Test DataflowCreateJavaJobOperator instance is properly initialized."""
        assert self.dataflow.jar == LOCAL_JAR_FILE
    @mock.patch("airflow.providers.google.cloud.operators.dataflow.BeamHook")
    @mock.patch("airflow.providers.google.cloud.operators.dataflow.DataflowHook")
    def test_check_job_not_running_exec(self, dataflow_hook_mock, beam_hook_mock):
        """Test DataflowHook is created and the right args are passed to
        start_java_workflow with option to check if job is running
        """
        is_job_dataflow_running_variables = None
        def set_is_job_dataflow_running_variables(*args, **kwargs):
            nonlocal is_job_dataflow_running_variables
            is_job_dataflow_running_variables = copy.deepcopy(kwargs.get("variables"))
        dataflow_running = dataflow_hook_mock.return_value.is_job_dataflow_running
        dataflow_running.side_effect = set_is_job_dataflow_running_variables
        dataflow_running.return_value = False
        start_java_mock = beam_hook_mock.return_value.start_java_pipeline
        self.dataflow.check_if_running = True
        self.dataflow.execute(None)
        expected_variables = {
            "project": dataflow_hook_mock.return_value.project_id,
            "stagingLocation": "gs://test/staging",
            "jobName": JOB_NAME,
            "region": TEST_LOCATION,
            "output": "gs://test/output",
            "labels": {"foo": "bar", "airflow-version": self.expected_airflow_version},
        }
        assert expected_variables == is_job_dataflow_running_variables
        job_name = dataflow_hook_mock.return_value.build_dataflow_job_name.return_value