Add Virgin Telco previous provider

CHANGELOG:

### Added
- [#1078](https://git.coopdevs.org/coopdevs/som-connexio/odoo-somconnexio/-/merge_requests/1078) Add Virgin Telco previous provider

Related card: https://trello.com/c/ZZyy0m4v/1724-nou-prove%C3%AFdor-previ-a-formularis-virgin-telco

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