mostly #7524 and #7413 so that "cancellations" of shift and shift_templates work fine especially when adding/changing shift

code cleaning : get rid of quick-and-dirty circular dependency fix by moving some code in separated file

#7426 : remove suspicious code introduced in v12 port and updating makeups_to_do inside a getter method

#7325 : use suppleant_member_id instead of parent_id or is_associated_people to perform binom checks

ajout nouveau champ configurable au process d'inscription : profession (champ également rendu modifiable post circuit d'inscription depuis l'espace membre)

efficiently fetch makeups to come data in order to (1) display members with only makeups to come and no makeups to do and (2) speed up display of makeups admin

template_created must be set to false to fully transform the shift registration in a makeup styled one and trigger odoo counter + 1