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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 -->


job = {"id": TEST_JOB_ID, "name": UNIQUE_JOB_NAME, "currentState": DataflowJobStatus.JOB_STATE_DONE}
        mock_list = self.mock_dataflow.projects.return_value.locations.return_value.jobs.return_value.list
        (mock_list.return_value.execute.return_value) = {"jobs": [job]}
        (
            self.mock_dataflow.projects.return_value.locations.return_value.jobs.return_value.list_next.return_value
        ) = None
        _DataflowJobsController(
            self.mock_dataflow, TEST_PROJECT, TEST_LOCATION, 10, UNIQUE_JOB_NAME
        ).get_jobs()
        mock_list.assert_called_once_with(projectId=TEST_PROJECT, location=TEST_LOCATION)
    def test_dataflow_job_wait_for_multiple_jobs(self):
        job = {
            "id": TEST_JOB_ID,
            "name": UNIQUE_JOB_NAME,
            "type": DataflowJobType.JOB_TYPE_BATCH,
            "currentState": DataflowJobStatus.JOB_STATE_DONE,
        }
        (
            self.mock_dataflow.projects.return_value.locations.return_value.jobs.return_value.list.return_value.execute.return_value
        ) = {"jobs": [job, job]}
        (
            self.mock_dataflow.projects.return_value.locations.return_value.jobs.return_value.list_next.return_value
        ) = None
        dataflow_job = _DataflowJobsController(
            dataflow=self.mock_dataflow,
            project_number=TEST_PROJECT,
            name=UNIQUE_JOB_NAME,
            location=TEST_LOCATION,
            poll_sleep=10,