Add 'has_landline_phone' attribute in product catalog
CHANGELOG:
### Added
- [#849](https://gitlab.com/coopdevs/odoo-somconnexio/-/merge_requests/849) Add 'has_landline_phone' attribute in product catalog and filter out products with internal flag 'contract_as_new_service' set to False
Related card: https://trello.com/c/5lE8tAO4/1315-nou-camp-haslandlinephone-per-productes-broadband-nou-camp-contractasnewservice
Edited by Pelayo García