[IMP] survey: allow to somehow customize certification report templates

This commit adds possibility to select a layout for certification rendering.
User can choose among 6 predefined layouts carefully designed and that should
cover all use cases, therefore removing any need of allowing customization.

It also adds possibility to preview certification directly from survey.

closes odoo/odoo#32675

Task: 1967652
Pr: #32675
Signed-off-by: Thibault Delavallee (tde) <tde@openerp.com>
Co-authored-by: Stefano Rigano <sri@odoo.com>
Co-authored-by: Quentin Mourier <qmo@odoo.com>