feat: add upgrade-plans app and k3s upgrade plan

- k3s using v1.24 upgrade channel (to stay on latest patch version available)

_argocd/apps/upgrade-plans.yaml

@@ -0,0 +1,18 @@
+apiVersion: argoproj.io/v1alpha1
+kind: Application
+metadata:
+  name: upgrade-plans
+  namespace: argocd
+spec:
+  destination:
+    namespace: system-upgrade
+    server: https://kubernetes.default.svc
+  project: default
+  source:
+    path: cluster-components/upgrade-plans
+    repoURL: https://gitlab.mareshq.com/gitops/mareshq/bee.git
+    targetRevision: HEAD
+  syncPolicy:
+    automated:
+      prune: true
+      selfHeal: true