feat(contract_view): Add parent_pack_contract_id field for IT
CHANGELOG:
### Added
- [#1083](https://git.coopdevs.org/coopdevs/som-connexio/odoo-somconnexio/-/merge_requests/1083) Add parent_pack_contract_id in contract view, only visible and editable for IT group
Related card: https://trello.com/c/gcSI9VTt/1720-susi-ha-de-poder-editar-el-parentpackcontractid
Edited by Gerard Funosas