fix(product_product): get offer with shared products
CHANGELOG:
### Fixed
- [#1062](https://git.coopdevs.org/coopdevs/som-connexio/odoo-somconnexio/-/merge_requests/1062) Sharing data products cannot be returned from product's `get_offer` or `get_product_wo_offer` methods
Related card: https://trello.com/c/9m35wY5C/1679-il-50-com-a-producte-bonificat-a-ov
Edited by Gerard Funosas