SSO global logout is not working anymore

**Décrivez le bug**
l'API de logout est censé permerttre un logout du SSO
https://semapps.org/docs/middleware/auth

L'implémentation fait uniquement un logout local et pas de logout du sso
https://github.com/assemblee-virtuelle/semapps/blob/master/src/middleware/packages/auth/mixins/auth.sso.js

**Etapes pour reproduire**
1. utiliser http://localhost:3000/auth/logout?global=true

**Comportement attendu**
logout du serveur des communs

Start with src/middleware/packages/auth/mixins/auth.sso.js and the /auth/logout?global=true entry point, then compare the behavior with the authentication documentation. Reproduce the issue locally and trace why the current implementation performs only local logout. Done means the global logout also logs out from the server des communs.

Written by the indexing model from the issue text.