Rely on the new `mail.message.schedule` model and follow the rest of the refactor from https://github.com/odoo/odoo/pull/95623. FWIW this cron isn't strictly needed to run every minute, as it runs at the specific time automatically.
Follow refactors from https://github.com/odoo/odoo/pull/95500 and https://github.com/odoo/odoo/pull/79259 for the client.
Improve the module by allowing to edit messages, instead of just deleting them. This was simpler than splitting the edit and delete checks in the client-side.
@moduon MT-3088