**Description**

This operator should cancel running workflow template `on_kill`. This option probably should be configurable because of request_id prameter in a job definition: https://googleapis.dev/python/dataproc/latest/gapic/v1/api.html#google.cloud.dataproc_v1.WorkflowTemplateServiceClient.instantiate_inline_workflow_template
https://googleapis.dev/python/dataproc/latest/gapic/v1/api.html#google.cloud.dataproc_v1.WorkflowTemplateServiceClient.instantiate_workflow_template

Note this will have to cancle the Google Long Running Operation for the workflow template (which will in turn cancel all children jobs and clean up relevant cluster).

**Use case / motivation**

Remove dangling workflow templates

**Related Issues**
#10381
#6371
"""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/v1/projects.regions.workflowTemplates/instantiate
    :param template_id: The id of the template. (templated)
    :param project_id: The ID of the google cloud project in which
        the template runs
    :param region: The specified region where the dataproc cluster is created.
    :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: