[IMP] website_slides,_survey: allow certification creation at frontend

Purpose
=======

Before this commit, in the front end, you had to create a certification before
adding it to a course. This commit allows creation of certification in
front-end with pre-filled settings.

Functional Spec
===============

1. On a course, add content, type certification, you can choose an existing one
   (normal flow) or create a new one in the dropdown by typing a new survey
   name (new flow).
3. When submitting (Publish or save as draft), a certification survey, with
   pre-filled settings is created and linked to the slide.
   Pre-filled settings:
        * One page per question
        * Attempts limit : 1
        * Time limit : no limit
        * Scoring without answers
        * Passing score : 70%
        * Is Certification : True
        * Email Template : Certification: Send by email
        * Give Badge : False
4. After submit, the user stays on the Course Content.
5. A toaster is displayed in the top right saying:
    Toaster's Title: Certification created
    Content: Follow this link to add questions to your certification.
    <a>Edit certification</a>

A website editor can select a certification (if available) for the creation of
a slide.

Task id: 1981399
PR #43577

Co-Authored-By: Florent Lejoly <fle@odoo.com>
Co-Authored-By: David Beguin <dbe@odoo.com>

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