**Description**
Currently, we can only pass custom Image name to  **DataprocClusterCreateOperator(),**
as the custom image expires after 60 days, we either need to update the image or we need to pass the expiration token.

Functionality is already available in **gcloud** and **REST**.

`gcloud dataproc clusters test_cluster ......
--image projects/<custom_image_project_id>/global/images/family/<family_name>
.......
`


**Use case / motivation**
The user should be able to pass either Custom Image or Custom Image family name,
so we don't have to update the image up on expiration or use expiration token.


**Are you willing to submit a PR?**
Yes

**Related Issues**
None
airflow/providers/google/cloud/operators/dataproc.py
"""
    Instantiate a WorkflowTemplate on Google Cloud Dataproc. The operator will wait
    until the WorkflowTemplate is finished executing.
    .. seealso::
        Please refer to:
        https://cloud.google.com/dataproc/docs/reference/rest/v1beta2/projects.regions.workflowTemplates/instantiate
    :param template_id: The id of the template. (templated)
    :type template_id: str
    :param project_id: The ID of the google cloud project in which
        the template runs
    :type project_id: str
    :param region: The specified region where the dataproc cluster is created.
    :type region: str
    :param parameters: a map of parameters for Dataproc Template in key-value format:
        map (key: string, value: string)
        Example: { "date_from": "2019-08-01", "date_to": "2019-08-02"}.
        Values may not exceed 100 characters. Please refer to:
        https://cloud.google.com/dataproc/docs/concepts/workflows/workflow-parameters