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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 -->


gcp_conn_id="airflow-conn-id",
           dag=my_dag,
       )
    ``template``, ``dataflow_default_options``, ``parameters``, and ``job_name`` are
    templated, so you can use variables in them.
    Note that ``dataflow_default_options`` is expected to save high-level options
    for project information, which apply to all dataflow operators in the DAG.
        .. seealso::
            https://cloud.google.com/dataflow/docs/reference/rest/v1b3
            /LaunchTemplateParameters
            https://cloud.google.com/dataflow/docs/reference/rest/v1b3/RuntimeEnvironment
            For more detail on job template execution have a look at the reference:
            https://cloud.google.com/dataflow/docs/templates/executing-templates
    :param deferrable: Run operator in the deferrable mode.
    """
    template_fields: Sequence[str] = (
        "template",
        "job_name",
        "options",
        "parameters",
        "project_id",
        "location",
        "gcp_conn_id",
        "impersonation_chain",
        "environment",
        "dataflow_default_options",
    )
    ui_color = "#0273d4"
    operator_extra_links = (DataflowJobLink(),)
    def __init__(