fix(test-env): remove namespace from kustomization (ArgoCD conflict)

Namespace test-env is shared between test-env and kargo-test-env-pipeline apps.
Having namespace.yaml in both causes ArgoCD OutOfSync conflict.
ArgoCD creates the namespace via syncOptions.CreateNamespace.

test-env/kustomization.yaml

@@ -2,7 +2,8 @@ apiVersion: kustomize.config.k8s.io/v1beta1
 kind: Kustomization
 
 resources:
-  - namespace.yaml
+  # NOTE: namespace.yaml removed — ArgoCD creates namespace via syncOptions.CreateNamespace
+  # The namespace is shared with kargo-test-env-pipeline app.
   # PostgreSQL 18.x-2.1C (image has built-in 1C entrypoint)
   - postgres/statefulset.yaml
   - postgres/service.yaml