- Replaces a randomly failing test by a simpler test. As reported by XDO (https://github.com/odoo/odoo/pull/123237#discussion_r1410620206), executing web requests asynchronously during the execution of a tour which does an RPC is randomly failing. The fix consists in not testing the full online payment flow with the cashier frontend interface, but instead simulate an order saved on the server and simulate real customer web requests for paying online for that order. - Simplifies the way payment portal URLs are build. closes odoo/odoo#145595 closes odoo/odoo#146029 Task-id: 3632217 Signed-off-by: Joseph Caburnay (jcb) <jcb@odoo.com> Signed-off-by: Théo Vincent (thvi) <thvi@odoo.com>