chore: enable prometheus ServiceMonitor in default kustomization

Uncomment the ../prometheus resource in config/default/ to include
the ServiceMonitor in the kustomize bundle. This allows the infra
repo's Flux Kustomization to deploy metrics scraping for
datum-controller-manager.

Author: scotwells

config/default/kustomization.yaml

@@ -24,7 +24,7 @@ resources:
 # [CERTMANAGER] To enable cert-manager, uncomment all sections with 'CERTMANAGER'. 'WEBHOOK' components are required.
 #- ../certmanager
 # [PROMETHEUS] To enable prometheus monitor, uncomment all sections with 'PROMETHEUS'.
-#- ../prometheus
+- ../prometheus
 # [METRICS] Expose the controller manager metrics service.
 - metrics_service.yaml
 # [NETWORK POLICY] Protect the /metrics endpoint and Webhook Server with NetworkPolicy.