This module makes the cart line quantity readonly for event tickets sold on website.

If the website customer wants to change the ticket quantity, (s)he has to remove the
line instead, and add new registrations from the event page.

This module is created to overcome these issues in the core workflow:

* https://github.com/odoo/odoo/issues/73058
* https://github.com/odoo/odoo/issues/84947
