Label metrics-controller instead of metrics-operator

[nlamirault]

The service metrics-operator-service have a metrics-controller label instead of metrics-operator

---
apiVersion: v1
kind: Service
metadata:
  labels:
    control-plane: metrics-controller
  name: metrics-operator-service
  namespace: keptn-lifecycle-toolkit-system
spec:
  ports:
  - name: https
    port: 8443
    protocol: TCP
    targetPort: https
  - name: custom-metrics
    port: 443
    targetPort: custom-metrics
  - name: metrics
    port: 9999
    protocol: TCP
    targetPort: metrics
  selector:
    control-plane: metrics-operator