[FIX] website: server_page match trailing slash

After this commit, if an url with trailing slash is not found we fallback
to the url without the slash with a redirect to respect seo.
With this change we have the same behavior that controllers.

We continue to support trailing slash if page explicitely created with /
via backend e.g. and for retrocompatibility.

task-2346185

closes odoo/odoo#58603

X-original-commit: 3d65424708d1623654756d58d78cec5f8d71276f
Signed-off-by: Jérémy Kersten (jke) <jke@openerp.com>

addons/website/models/ir_http.py

@@ -250,6 +250,10 @@ class Http(models.AbstractModel):
         # specific page first
         page = request.env['website.page'].sudo().search(published_domain, order='website_id asc', limit=1)
 
+        # redirect withtout trailing /
+        if not page and req_page.endswith("/"):  # / handled by controller
+            return request.redirect(req_page[:-1])
+
         if page:
             # prefetch all menus (it will prefetch website.page too)
             request.website.menu_id