[FIX] (test_)sale(_product_configurators): fix nightly race condition

Fix some uncommon nightly error on the runbot where a race condition
happened when the tour finished too soon. The test is successful but
during the browser cleanup, things are still happening.

task-2832564

closes odoo/odoo#91920

Related: odoo/enterprise#27600
Signed-off-by: Victor Feyens (vfe) <vfe@odoo.com>