VoIP now relies on the existing phone validation process for phone and mobile numbers instead of keeping duplicate sanitized fields. This reduces redundant data handling and helps keep contact and call information consistent with less maintenance overhead.

Since phone numbers in `phone` and `mobile` fields are already sanitized by the phone_validation module, there is no need to have the `sanitized_phone` and `sanitized_mobile` fields.

Part of task-2832241
Upgrade: odoo/upgrade#3530