feat(partner_otrs_view): add has_active_contracts field

CHANGELOG:

### Added
- [#895](https://gitlab.com/coopdevs/odoo-somconnexio/-/merge_requests/895) Add has_active_contracts field to OTRS Contacts view

Related card: https://trello.com/c/gtaRBIhx/1425-vista-otrs-a-odoo-afegir-el-camp-hasactivecontract-t%C3%A9-contractes-actius

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