Feat: promotion-intercooperation-agreements
CHANGELOG:
### Add
- [#1268](https://git.coopdevs.org/coopdevs/som-connexio/odoo-somconnexio/-/merge_requests/1268) Add first_month_promotion field in CoopAgreement model & tag to create new CRMLead
Related card: https://trello.com/c/jvggVKj4
Edited by Borja Gimeno