CHORE(argocd): disable unused ArgoCD controllers

- notifications: Not using alerts
- applicationset: Not using ApplicationSet templates
- dex: Using Authelia SSO instead
- Saves ~200-300 MiB memory and removes 3-minute reconciliation loop

argocd/kustomization.yaml

@@ -6,3 +6,4 @@ resources:
 - argocd-rbac-cm.yaml
 - argocd-cmd-params-cm.yaml
 - ingress.yaml
+- disable-unused-controllers.yaml