feat(BroadbandISPInfo): add mobile_pack_contracts

CHANGELOG:

### Changed
- [#926](https://git.coopdevs.org/coopdevs/som-connexio/odoo-somconnexio/-/merge_requests/926) Adapt Change address process to packs.

Related card: https://trello.com/c/eKfYKgBC/1432-proc%C3%A9s-finalitzaci%C3%B3-contracte-ba

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⚠ Needs https://git.coopdevs.org/coopdevs/som-connexio/otrs-somconnexio/-/merge_requests/160