Add owner references to dependent resources
As decided in https://gitlab.cern.ch/webservices/webframeworks-planning/-/issues/155 and already assumed by the watch logic, all resources generated by the reconciliation on behalf of the reconciled resource need to set it as an owner reference.
Example owner reference: https://gitlab.cern.ch/webservices/webeos/webeos-site-operator/-/blob/master/controllers/webeossite_controller.go#L296