REFACTOR(goldilocks): use managedNamespaceMetad...

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

node-exporter/kustomization.yaml

@@ -1,5 +1,3 @@
 apiVersion: kustomize.config.k8s.io/v1beta1
 kind: Kustomization
-
-resources:
-  - namespace.yaml
+resources: []