Feature/add previous service address to cu tickets

CHANGELOG:

### Added
- [#645](https://gitlab.com/coopdevs/odoo-somconnexio/-/merge_requests/645) Save previous service address to BA contracts to send it to OTRS Change Address tickets

Related card: https://trello.com/c/jwiEpgIj/913-camps-que-han-dapar%C3%A8ixer-al-nou-ticket-de-cu

⚠ Requires this MR merged so the pipelines passes: https://gitlab.com/coopdevs/otrs-somconnexio/-/merge_requests/107