[FIX] website_sale: fix tb on dashboard when no sale access

Before this commit, if you don't have the sale access right, when you arrive on
main website menu, the dashboard try to load some utms data and will fail with
a traceback.

Now we don't render utm graph it you don't have the sale access right

This commit closes odoo/odoo#54695

closes odoo/odoo#55785

Signed-off-by: Jérémy Kersten (jke) <jke@openerp.com>