Belgian payroll time off requests will no longer create an eDRS activity for the person submitting or processing the request when no notified time off officers are configured. This prevents unnecessary or incorrectly assigned follow-up tasks and keeps notifications aligned with the leave type settings.

The eDRS activity on time off request is sent to the current logged in user if there are no `Notified Time Off Officers` specified on the leave type. However, this shouldn't be the case. The activity shouldn't be created if there are no `Notified Time Off Officers`.

These changes address this issue.

task-4267132

This change reverses a previous behavior where submitting a website helpdesk form could set or change the related customer on a task based on the email entered in the form. This helps avoid incorrect customer associations and keeps helpdesk/task records aligned with the intended contact data.

COM PR: odoo/odoo#186140
UPG PR: odoo/upgrade#6715

task-4295363