Following the removal of the auto_confirm field on event
and the payment_status computation, we improve the design
and flow of the event module.
- Adapt and simplify the kanban view for event
- Add the payment_status on graph view
- Improve the payment_status field in registration views (banners)
- Fallback on the registration page if there is not enough seats
after filling the registrations info with an error message.
task-3061849
Part-of: odoo/odoo#126431