[Backport release-1.0] [platform] Prevent version cm from deletion (#2114)

# Description
Backport of #2112 to `release-1.0`.

packages/core/platform/templates/cozystack-version.yaml

@@ -6,6 +6,8 @@ kind: ConfigMap
 metadata:
   name: cozystack-version
   namespace: {{ .Release.Namespace }}
+  annotations:
+    helm.sh/resource-policy: keep
 data:
   version: {{ .Values.migrations.targetVersion | quote }}
 {{- end }}