feat: migrate elastic-system to ArgoCD

Migrate ECK operator from Terragrunt to ArgoCD/Kustomize.
Deploys eck-operator v3.2.0 with 2 replicas and PodDisruptionBudget
in the elastic-system namespace.

💘 Generated with Crush

Assisted-by: Claude Sonnet 4.6 via Crush <crush@charm.land>

argocd/applicationsets/platform.yaml

@@ -12,16 +12,17 @@ spec:
       directories:
       - path: apps/overlays/*/artifactapi
       - path: apps/overlays/*/cattle-system
-      - path: apps/overlays/*/certificates
       - path: apps/overlays/*/cert-manager
+      - path: apps/overlays/*/certificates
       - path: apps/overlays/*/cnpg-system
+      - path: apps/overlays/*/elastic-system
       - path: apps/overlays/*/externaldns
       - path: apps/overlays/*/inteldeviceplugins-system
+      - path: apps/overlays/*/jfrog
       - path: apps/overlays/*/node-feature-discovery
+      - path: apps/overlays/*/puppet
       - path: apps/overlays/*/reflector-system
       - path: apps/overlays/*/reloader-system
-      - path: apps/overlays/*/jfrog
-      - path: apps/overlays/*/puppet
       - path: apps/overlays/*/woodpecker
   template:
     metadata: