Remove pack validations

CHANGELOG:

### CHANGED
- [#907](https://git.coopdevs.org/coopdevs/som-connexio/odoo-somconnexio/-/merge_requests/907/) Remove pack validations

Related card: https://trello.com/c/dFImPU45/1457-validaciones-de-crmlead-con-m%C3%A1s-de-dos-l%C3%ADneas-para-packs

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