[IMP] test_themes, theme_* : Adapts tours for new dragNDrop system

Following the change in the way of dragging and dropping a snippet onto
the page (by selecting it from a dialog displaying the actual previews
of snippets). The themes tours have been adapted to this change in this
commit.

task-3919405

closes odoo/design-themes#817

Related: odoo/odoo#166967
Related: odoo/enterprise#66150
Signed-off-by: Robin Lejeune (role) <role@odoo.com>

theme_vehicle/static/src/js/tour.js

@@ -6,26 +6,32 @@ const snippets = [
     {
         id: 's_cover',
         name: 'Cover',
+        groupName: "Intro",
     },
     {
         id: 's_text_image',
         name: 'Text - Image',
+        groupName: "Content",
     },
     {
         id: 's_image_text',
         name: 'Image - Text',
+        groupName: "Content",
     },
     {
         id: 's_picture',
         name: 'Title - Image',
+        groupName: "Images",
     },
     {
         id: 's_masonry_block',
         name: 'Masonry',
+        groupName: "Images",
     },
     {
         id: 's_call_to_action',
         name: 'Call to Action',
+        groupName: "Content",
     },
 ];