PURPOSE
Purpose of this task is to cleanup attachment management done in generic mail
models overrides and move it in account as model overrides.
SPECIFICATIONS
Update addons
* in purchase and sale: context key update should be done at message_post
level, especially this is not used in mass mailing mode;
* in website_sale: code to update sale order to avoid sending recovery
emails several times belongs to a "post hook" method on sale order model;
* in loyalty: remove a deprecated / unsupported 'mark_coupon_as_sent' key;
Task-2792146 (Mail: Move model-dependent code from composer / template)
Part-of: odoo/odoo#106658
Thibault Delavallée
0be5b37008