REFACTOR(goldilocks): use managedNamespaceMetadata for namespace labels

- Remove namespace.yaml files
- Add managedNamespaceMetadata with Goldilocks label
- Set CreateNamespace=true in syncOptions
- Update kustomization.yaml to remove namespace.yaml references

longhorn/kustomization.yaml

@@ -1,11 +1,8 @@
 apiVersion: kustomize.config.k8s.io/v1beta1
 kind: Kustomization
-
 namespace: longhorn-system
-
 resources:
-  - namespace.yaml
-  - ingress.yaml
-  - nodes/mayne-vcn.yaml
-  - nodes/mayne-worker-1.yaml
-  - nodes/mayne-worker-2.yaml
+- ingress.yaml
+- nodes/mayne-vcn.yaml
+- nodes/mayne-worker-1.yaml
+- nodes/mayne-worker-2.yaml