Feature Request: Expose OCI-Sync SHA as Metric in Grafana

### 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

This feature request aims to make the oci-sync SHA available as a metric in Metrics Explorer, similar to git-sync. This would allow customers to expose this data in Grafana dashboards to other teams without requiring direct project access. The current limitation prevents the full GitOps paradigm implementation, as the commit label for oci-sync is missing. The customer views metrics as a higher priority than UI availability for this feature

### Importance

_No response_