RATIONALE
Simplify field management for mail / phone / sms flows. Make it working out
of the box, easier to use and tweak.
SPECIFICATIONS
'_sms_get_default_partners' exists in SMS to find default customers to
notify when sending automated SMS. It can be replaced by '_mail_get_partners'
helper available on BaseModel in mail.
A specific case exists in calendar where it was overridden to avoid notifying
attendees that declined the event, notably for alarms. This feature has been
moved directly in the reminder sending method, to keep behavior coherent.
Test is updated accordingly, and is now really using the SMS mocks to simulate
the sending.
Task-3422449 (Mail, Phone: Move and improve field helpers)
Part-of: odoo/odoo#130468
Thibault Delavallée
7f83f510e7