This commit adds a test that makes sure templates can be rendered on
all themes and that they neither contain duplicate classes nor
contradicting ones.
Covered templates:
- snippet blocks
- configurator snippet customizations
- new page template snippet customizations
task-3562147
closesodoo/design-themes#731
Related: odoo/odoo#139572
Signed-off-by: Romain Derie (rde) <rde@odoo.com>
Benoit Socias