Refactor: move openebs and sealed-secrets to ArgoCD, use valuesObject

- Remove OpenEBS from k0s.yaml bootstrap (deploy via ArgoCD instead)
- Remove sealed-secrets from bootstrap Helm chart (deploy via ArgoCD)
- Convert helm values to valuesObject in Argo apps

apps/infra/openebs.yaml

@@ -10,7 +10,7 @@ spec:
   source:
     repoURL: https://openebs.github.io/openebs
     chart: openebs
-    targetRevision: "4.2.0"
+    targetRevision: "4.4.0"
     helm:
       releaseName: openebs
       valuesObject: