4.0: backport or avoid cubicweb_web.webconfig.WebConfiguration
This start the question of : how we should start CW 4.0 without the web module?
Also if we keep it in cubicweb_web we need a way for this cube to register a configuration just like here https://forge.extranet.logilab.fr/cubicweb/cubicweb/-/blob/branch/default/cubicweb/cwconfig.py#L818