Limit `update_ticket_with_coverage_info` method to BA tickets

CHANGELOG:

### Changed
- [#601](https://gitlab.com/coopdevs/odoo-somconnexio/-/merge_requests/601) Limit `update_ticket_with_coverage_info` method to BA tickets

Related card: https://trello.com/c/uEB5uMsP/920-petici%C3%B3-fer-apar%C3%A8ixer-articles-consulta-cobertura-nom%C3%A9s-al-proc%C3%A9s-de-fibra

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