Partial backport of odoo/odoo@94fa8d962535a754c9fb26997a38cc8b51b8974e keeping only event_crm part as
other changes were done only for Odoo16.

In this commit we try to compare formatted phones of registration and
partner, before checking the actual phone numbers. If only formatting
differs then it is not a different number.

Task-3431124

Part-of: odoo/odoo#128823