[IMP] ci: test the ISOLATE addons in their own database

website_sale_disable_cart removes the cart from every website once
installed, which breaks website_membership_signup_required when CI installs
everything together. The repo is shared by clients that never install them
together: run_tests.py now tests each ISOLATE addon in its own database,
after the rest, and ci.yml isolates website_sale_disable_cart.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

.gitea/workflows/ci.yml

@@ -50,6 +50,11 @@ jobs:
             # este repo (ecocentral depende de él): se prueba el checkout del PR,
             # no ese clon.
             ODOO_SRC_SKIP: addons-cm
+            # Se prueban cada uno en su propia base de datos: instalados junto
+            # al resto les cambian el comportamiento. website_sale_disable_cart
+            # quita el carrito a todos los sitios web y rompe, por ejemplo, el
+            # alta con cuota de website_membership_signup_required.
+            ISOLATE: website_sale_disable_cart
             # Si los tests pasan, deja aquí el .pot de cada addon para el job review.
             # Está en la caché que el runner monta en todos los jobs.
             BOT_POT_DIR: /root/.cache/eco-pr-bot/pot