Is your feature request related to a problem? Please describe.
When using Client.get_default_handler CloudLoggingHandler is being used automatically for Cloud Run jobs resource. And while #877 fixes the missing labels we're still gonna be using background transport when simplier stdout is doing just fine.

Describe the solution you'd like
If we modify this check

and allow _RUN_RESOURCE_TYPE OR _CLOUD_RUN_JOB_RESOURCE_TYPE resource type then a structured log handler is gonna be used automatically which should be a better default.

Describe alternatives you've considered
Meanwhile I am using handler = StructuredLogHandler(project_id=client.project) instead of handler = client.get_default_handler() where client is client = CloudLoggingClient()