Mattermost Operator should depend on Istio/Gatekeeper

During a deploy, Mattermost Operator comes up early:

Every 2.0s: kubectl get pods,ns,kustomizations,helmreleases,gitrepositories -A                                                                                                                                                                                                                                                                                                           Toms-MacBook-Pro.local: Mon Mar  1 10:05:34 2021

NAMESPACE             NAME                                                 READY   STATUS    RESTARTS   AGE
kube-system           pod/local-path-provisioner-7ff9579c6-bwpz6           1/1     Running   0          9m40s
kube-system           pod/coredns-66c464876b-k2vfq                         1/1     Running   0          9m40s
kube-system           pod/metrics-server-5d5c49f488-fqqr5                  1/1     Running   0          4m18s
flux-system           pod/helm-controller-59c6dd8bb-zvckm                  1/1     Running   0          4m12s
flux-system           pod/notification-controller-657645fcd7-rw82m         1/1     Running   0          4m12s
flux-system           pod/source-controller-5c49d78ffc-cbwwc               1/1     Running   0          4m11s
flux-system           pod/kustomize-controller-74769f7b4c-xsh8d            1/1     Running   0          4m12s
mattermost-operator   pod/mattermost-operator-8498bf9f46-xq5jr             1/1     Running   0          31s
gatekeeper-system     pod/gatekeeper-controller-manager-649c85f548-hs546   0/1     Running   0          28s
gatekeeper-system     pod/gatekeeper-audit-ff78f97c5-kfr72                 0/1     Running   0          29s
gatekeeper-system     pod/gatekeeper-controller-manager-649c85f548-jlqdb   0/1     Running   0          28s
gatekeeper-system     pod/gatekeeper-controller-manager-649c85f548-tp7x2   0/1     Running   0          29s