[READY][3.9] Fix some patch migration issues

**Remaining Tasks**

 - [x] Login field from User entity must be set a utf8_bin column to be case sensitive, this broke the migration when two users with the same login but not the same case are created.

 - [x] Add a patch to ensure that LazaretSession entities do not refers to non existing users, this broke the migration because of the foreign key applied on LazaretSession.user_id column