[FIX] mail: send ir.needaction notifications

Revision on https://github.com/odoo/odoo/commit/de7c119e666d108564b3889d1c08e5bf2e4da082



Partners are registered on notification channel
`(dbname, 'ir.needaction', partner_id)`.

closes odoo/odoo#34974

Signed-off-by: Xavier Dollé (xdo) <xdo@odoo.com>