Cloud Run Jobs produce logs with incorrect resource type (not supported?) #1514

Problem

Cloud Run Jobs environment and resource type detection is not supported by MonitoredResourceUtil and MetadataLoader

Steps to reproduce

Use the library's default configuration with Cloud Run Jobs.

Expected result

System out produces log entries with the following resource section:

resource: {
   labels: {
      job_name: "migrations"
      location: "us-central1"
      project_id: "prj-my-project"
   }
   type: "cloud_run_job"
}

Actual result

... whereas logs produced by the library have the following:

resource: {
   labels: {
      project_id: "prj-my-project"
   }
   type: "global"
}

what makes them invisible from Cloud Run Job's execution Logs UI, and you can only see them if you go to log explorer and filter out by "global" resource type.