[API] don't store ID tokens in DB

fix #6857

fix migration for invitation-cleanup

delete invitations-table (and constraints) before deleting the users

Add rake task to move jobs from any legacy queue to the default queue

Cleanup invitations

also display message if the user has no invitations left and refactored
InvitationsController spec and remove unused message parameter

otherwise the counter goes into negative ;)

also  reset all negative counters

Fix charcounter position in publisher