feat(service_monitor): don't deploy if not enabled

!8

templates/ServiceMonitor-Kubelet.yaml

@@ -1,3 +1,4 @@
+{{ if .Values.nfc_monitoring.prometheus.service_monitor.kubelet }}
 ---
 apiVersion: monitoring.coreos.com/v1
 kind: ServiceMonitor
@@ -85,3 +86,5 @@ spec:
   selector:
     matchLabels:
       app.kubernetes.io/name: kubelet
+
+{{ end }}