keycloak-resources unit not ready if rancher is disabled

if rancher is disabled, keycloak-resources unit is not ready due to healthCheck for secret: keycloak-client-secret-rancher-client

root@rke2:/home/ubuntu/sylva-core# k get Kustomization/keycloak-resources
NAME                 AGE   READY   STATUS
keycloak-resources   43h   False   health check failed after 30.018914443s: timeout waiting for: [Secret/keycloak/keycloak-client-secret-rancher-client status: 'NotFound']

this healthCheck for keycloak-resources has to be conditionalized as this secret will only be created when Client : rancher is deployed which is created by rancher-init unit

cc @bogdan.antohe @pseite @dragos.gerea @tmmorin