Fix MariaDB operator deployment namespace issue

- Remove namespace from kustomization.yaml (was putting Apps in wrong namespace)
  - Change destination to argocd namespace (Application resources must be there)
  - Add labels for tracking parent app

mariadb-operator/kustomization.yaml

@@ -1,6 +1,5 @@
 apiVersion: kustomize.config.k8s.io/v1beta1
 kind: Kustomization
-namespace: mariadb-system
 resources:
   - operator-crds-helm.yaml
   - operator-helm.yaml