fix(observability): 🐛 enable GARM unauthenticated metrics + ArgoCD metrics on all instances

- GARM dev.t09.de: set garm.metrics.disableAuth=true to unblock Prometheus scraping (was 401)
- ArgoCD dev.t09.de: add controller/server/repoServer/applicationSet metrics blocks
- ArgoCD edp.buildth.ing: add controller/server/repoServer/applicationSet metrics blocks
- ArgoCD benchmark.t09.de: add controller/server/repoServer/applicationSet metrics blocks
- observability.buildth.ing already had metrics enabled (no change needed)

otc/benchmark.t09.de/stacks/core/argocd/values.yaml

@@ -35,6 +35,30 @@ configs:
   tls:
     certificates:
 
+controller:
+  metrics:
+    enabled: true
+    serviceMonitor:
+      enabled: false
+
+server:
+  metrics:
+    enabled: true
+    serviceMonitor:
+      enabled: false
+
+repoServer:
+  metrics:
+    enabled: true
+    serviceMonitor:
+      enabled: false
+
+applicationSet:
+  metrics:
+    enabled: true
+    serviceMonitor:
+      enabled: false
+
 notifications:
   enabled: false