Test Argo CD self-management with argocd-cm annotation

Add test annotation to argocd-cm ConfigMap to verify that Argo CD
automatically syncs changes to its own configuration.

Co-Authored-By: Paperclip <noreply@paperclip.ing>

apps/argocd/argocd-install.yaml

@@ -31221,6 +31221,8 @@ kind: ConfigMap
 metadata:
   labels:
     app.kubernetes.io/name: argocd-cm
+  annotations:
+    test.self-management: "enabled"
 data:
   url: https://argo.basicstack.de
   oidc.config: |