feat(observability): disable grafana on victoria and install via operator

otc/observability.think-ahead.cloud/stacks/observability/grafana-operator.yaml

@@ -0,0 +1,26 @@
+apiVersion: argoproj.io/v1alpha1
+kind: Application
+metadata:
+  name: grafana-operator
+  namespace: argocd
+  labels:
+    env: dev
+spec:
+  project: default
+  syncPolicy:
+    automated:
+      selfHeal: true
+    syncOptions:
+      - CreateNamespace=true
+      - ServerSideApply=true
+  destination:
+    name: in-cluster
+    namespace: observability
+  sources:
+    - chart: grafana-operator
+      repoURL: oci://ghcr.io/grafana/helm-charts
+      targetRevision: v5.18.0
+      releaseName: grafana-operator
+    - repoURL: https://forgejo.edf-bootstrap.cx.fg1.ffm.osc.live/DevFW-CICD/stacks-instances
+      targetRevision: HEAD
+      path: "otc/observability.think-ahead.cloud/stacks/observability/grafana-operator/manifests"