chore: add metrics service to prometheus component

Include metrics_service.yaml in the prometheus kustomize Component
so that deploying with the prometheus component provides both the
ServiceMonitor and the matching Service for metrics scraping.

Author: scotwells

config/prometheus/kustomization.yaml

@@ -2,3 +2,4 @@ apiVersion: kustomize.config.k8s.io/v1alpha1
 kind: Component
 resources:
   - monitor.yaml
+  - ../default/metrics_service.yaml