Fix dates to unblock mobile pack

CHANGELOG:

### Changed
- [#960](https://git.coopdevs.org/coopdevs/som-connexio/odoo-somconnexio/-/merge_requests/960) When creating a fiber contract associated with mobile, send both activation and introduced dates to UnblockMobilePackTicket service in OTRS

Related card: https://trello.com/c/As5bVci8/1520-canvi-en-dates-dactivaci%C3%B3-de-m%C3%B2bil-al-finalitzar-fibra

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⚠ Depends on https://git.coopdevs.org/coopdevs/som-connexio/otrs-somconnexio/-/merge_requests/188/diffs