FIX(argocd): sharedresourcewarning by referencing

- argocd.yaml files d...
- Change monitoring/kustomization.yaml to reference argocd.yaml files
  instead of folders
- Comment out argocd.yaml in each app's kustomization.yaml
- Matches applications folder pattern to avoid resource conflicts

grafana/kustomization.yaml

@@ -2,7 +2,8 @@ apiVersion: kustomize.config.k8s.io/v1beta1
 kind: Kustomization
 
 resources:
-  - argocd.yaml
+  # ArgoCD Application은 monitoring/kustomization.yaml에서 관리
+  # - argocd.yaml
   - namespace.yaml
   - vault/grafana-admin-password.yaml
   - ingress.yaml