fix(external-dns): Fix namespace creation

infrastructure/base/external-dns/kustomization.yaml

 apiVersion: kustomize.config.k8s.io/v1beta1
 kind: Kustomization
-namespace: longhorn-system
+namespace: external-dns-system
 resources:
   - namespace.yaml
   - repository.yaml
@@ -8,4 +8,7 @@ resources:
   - ../../../shared/networkpolicies/allow-from-monitoring.yaml
 
 commonLabels:
-  app.kubernetes.io/name: external-dns
\ No newline at end of file
+  app.kubernetes.io/name: external-dns
+
+components:
+  - ../../../shared/components/namespace-restricted
\ No newline at end of file

infrastructure/base/external-dns/namespace.yaml

+apiVersion: v1
+kind: Namespace
+metadata:
+  name: external-dns-system
+  labels: {}