Feat(CoopAgreement): show related partner's name instead of code
CHANGELOG:
### Added
- [#1142](https://git.coopdevs.org/coopdevs/som-connexio/odoo-somconnexio/-/merge_requests/1142): With Coop Agreements, show their related partner's name instead of their code.
Related card: https://trello.com/c/PTLFCqlo/1788-mostrar-a-subscriptionrequest-el-nom-de-lentitat-que-tenim-conveni-i-no-el-codi
Edited by Gerard Funosas