fix(apps): drop dangling namespace.yaml ref after 0a98674

namespace.yaml was deleted but kustomization still listed it, so
kustomize build fails and the enterprise-apps app-of-apps cannot
render the overlay (ComparisonError) — forte-drop-secrets and the
other overlay resources stopped syncing. The namespace itself is
owned by the forte-drop Application's CreateNamespace=true.

apps/overlays/upc-dev/forte-drop/kustomization.yaml

@@ -1,7 +1,6 @@
 apiVersion: kustomize.config.k8s.io/v1beta1
 kind: Kustomization
 resources:
-- namespace.yaml
 - forte-drop.yaml
 - keycloak-client-forte-drop.yaml
 - forte-drop-pdb.yaml