Add TrucadesIllimitades12GB product

CHANGELOG:

### Added
- [#1118](https://git.coopdevs.org/coopdevs/som-connexio/odoo-somconnexio/-/merge_requests/1118) Add TrucadesIllimitades12GB product 

Related card: https://trello.com/c/PLFUL2uB/1766-afegim-illimitades-12

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