[FIX] survey: sending emails

Emails are now send once by recipient. If there is a partner_id, use it as
recipient using the correct recipient_ids field, not partner_ids (not the
same meaning, recipients for emails use recipient_ids). Use the email_to
if there is no partner_id. Indeed this method is called with partner_id
and email being the same recipient.

Also added auto delete to generated emails. As partner_ids is not used anymore
the mails are not considered as notifications and stay in the mail_mail table.
There is no need to stock those emails.

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