Feature Request: Surface an error/warn if the resource is a job

### Checklist

- [x] I did not find a related open enhancement request.
- [x] I understand that enhancement requests filed in the GitHub repository are by default low priority.
- [x] If this request is time-sensitive, I have submitted a corresponding issue with [GCP support](https://cloud.google.com/support-hub).

### Describe the feature

Surface an error or warning if source includes Job.

https://docs.cloud.google.com/kubernetes-engine/config-sync/docs/concepts/gitops-best-practices#avoid-jobs

### Importance

_No response_