[REF] Substitue mail_activity_team for new "level" field
CHANGELOG:
### Changed
- [#1279](https://git.coopdevs.org/coopdevs/som-connexio/odoo-somconnexio/-/merge_requests/1279) Substitute mail_activity_team for new "level" field
Related card: https://trello.com/c/7s1CEjVz/1949-nivell-dactivitats-com-a-camp-independent-de-team