- base.res_partner_1 no longer exists; create a partner in setUpClass.
- test_remove_inactive_config_sessions passed a product.config.line id as
  product_tmpl_id, which violated the FK on Odoo 19; use a real
  product.template instead.

…olicy

The discount_policy field was removed from product.pricelist; passing it
on create raises ValueError on Odoo 19.

sale.order.line.product_uom was renamed to product_uom_id in Odoo 19.

sale.order._cart_update was removed in favour of _cart_add and
_cart_update_line_quantity. Rewrite the test to exercise the module's
overrides through the new API and assert the configuration session is
preserved across quantity updates and that a zero quantity removes the
line.

Port the website configurator tour to the Odoo 19 web_tour API so the
HttpCase tours (test_01_admin_config_tour / test_02_demo_config_tour)
run green:

- Replace the removed trigger/extra_trigger style with the current
  single-trigger steps and modern run helpers.
- Scope the dependent <select> steps with :has(option:contains(...))
  so each step waits for its options to be rendered after the previous
  onchange RPC, instead of racing it (avoids the empty-value select
  error).
- Mark the steps that navigate (search/select the product, and the
  final Continue) with expectUnloadPage: true. The final Continue
  submits the configuration (save_configuration, submit_configuration
  = true) and redirects via window.location from the RPC callback, so
  the unload fires asynchronously; keeping expectUnloadPage on the last
  step keeps allowUnload true and lets the tour finish on the
  configured product page.