Implement spec.uid for GrafanaContactPoint

[Baarsgaard]

While implementing this, I noticed a lot of discrepancies between the ContactPoint CR and the others.
Once this is merged I'll open a PR fixing the missing error logs when ContactPoints fail to reconcile as well as implementing the same Status fields that other CRs use. (See: 7e81cb4)

Manual Testing

make start-kind
kind export kubeconfig --name kind-grafana
kubectl delete grafana-operator --all
kubectl apply -f tests/example-resources.yaml
kubectl apply -f tmp.yml # See resources below
kubectl port-forward svc/grafana-testdata-service 3000 >/dev/null &
# Open http://localhost:3000/alerting/notifications
# username: root
# password: secret


# See that the default and two new contact points are present.
# Exporting all of them should show 3 UIDs
# Empty string, generated, and spec-uid
# Repeatedly deleting and applying tmp.yml should result in a new UID for the generated one.

tmp.yml

---
apiVersion: grafana.integreatly.org/v1beta1
kind: GrafanaContactPoint
metadata:
  name: metadata-uid
  namespace: default
spec:
  resyncPeriod: 3s
  instanceSelector:
    matchLabels:
      test: testdata
  name: metadata-uid
  type: email
  settings:
    addresses: "[email protected]"
---
apiVersion: grafana.integreatly.org/v1beta1
kind: GrafanaContactPoint
metadata:
  name: constant-uid
  namespace: default
spec:
  resyncPeriod: 3s
  instanceSelector:
    matchLabels:
      test: testdata
  uid: spec-uid
  name: spec-uid
  type: email
  settings:
    addresses: "[email protected]"

[theSuess]

Thanks for the contribution! I've replaced a reference to "folder" and will merge now!