[FIX] mail: Harmonize _mail_find_partner_from_emails returned values
[FIX] mail: Harmonize _mail_find_partner_from_emails returned values

Purpose
=======

Before this commit, the method _mail_find_partner_from_emails could
return a list mixing partner ids and partner recordset, that could
lead to issue when trying to read the different elements.

With this commit, we ensure that we return a list of records only.

closes odoo/odoo#44608

X-original-commit: 2fbbbd8609fd2e08545ddb1ab8e2d7d22ee4d292
Signed-off-by: Yannick Tivisse (yti) <200a91eb0e5cc4726d6a3430713b580138f34298@odoo.com>

ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo