[IMP] Add `code` to previous_provider_view

CHANGELOG:

### Added
- [#1173](https://git.coopdevs.org/coopdevs/som-connexio/odoo-somconnexio/-/merge_requests/1173) Add `code` to previous provider tree view

Related card: https://trello.com/c/4Eun5jWj/1835-afegir-codi-a-la-vista-tree-de-prove%C3%AFdor-previ

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