Block OC contract creation to partners with corresponding flag activated
CHANGELOG:
### Added
- [#775](https://gitlab.com/coopdevs/odoo-somconnexio/-/merge_requests/775) Add boolean flag to partners which blocks automatized OC contract creation
Related card: https://trello.com/c/IkcFmwDL/1203-flag-no-creaci%C3%B3-autom%C3%A0tica-a-opencell
Edited by Pelayo García