[notification] use an InternalManager object for notifications if we have an (email, lang) tuple The non-uniform handling of CWUser vs (email, lang) tuple has caused too many bugs; this change mostly unifies the two code paths. Closes #3381521

if versions_map['cubicweb'][0] == (3, 7, 4):
    config['http-session-time'] *= 60
    config['cleanup-session-time'] *= 60
    config['cleanup-anonymous-session-time'] *= 60