Add ServiceMonitor annotations

What does this MR do?

Add ServiceMonitor annotations.

Why was this MR needed?

This can be used in ArgoCD:

metrics:
  serviceMonitor:
    annotations:
      argocd.argoproj.io/sync-options: SkipDryRunOnMissingResource=true

Cf. https://argo-cd.readthedocs.io/en/stable/user-guide/sync-options/#skip-dry-run-for-new-custom-resources-types