[REF] website_slide_survey: improve integration into eLeaning application

PURPOSE

eLearning should have its own application in manager. Indeed this is becoming
a big application and having it embedded inside Website application is not
enough anymore. It should also hold updated and easy-to-use menus,
navigation, actions and views in backend.

SPECIFICATIONS

Add menu entry inside Courses
  * Certifications: kanban view of surveys of type certificate

Add menu entry inside Reporting
  * Certifications: list view on surveys of type certificate
    Columns: Title, Survey Stage, Registered People, Certified People, Attempts
    Success Rate (certified/attempts), Average Results

LINKS

Task 1978729
PR #35061

Co-Authored-By: Thibault Delavallée <tde@odoo.com>
Co-Authored-By: Jérémy Hennecart <jeh@odoo.com>