allow superadmin to delete users in tav env + fix impersonating + return to preventing impersonating in prod envs

rework ab830d48 so that A ce jour statistics area depends on tav_env

BIG UPDATE ON ADMIN LIST : add export on top + add createdAt and updatedAt filter on different views with datepicker + add cotisation end of validity date instead of 'yes' in list + add free cotisation to manager in admin presta list view