Remove autoconfirm logic and simplify the flow of event
registrations. Now a registration is by default considered
as confirmed.
The draft state is kept for registrations with
a payment pending.
These registrations are no longer counted
as expected attendees for the seats computation.
To match the behavior of events, we also add a seats_expected
computed field on event tickets.
The registration status is now based on the sale order state.
So the payment_status field is renamed sale_status.
We consider now that a registration linked to a SO in a sale
state should be confirmed and reserved.
A sale order is in the `sale` state when manually confirmed
or when the transactions done match the amount_total of the
sale order.
We also rename the seats_expected field into seats_taken to
better match the process. It was a bit weird to have expected
in the name when the registration attended were counted into it.
UPG PR: odoo/upgrade#4836
task-3061849
Part-of: odoo/odoo#126431
Jérémy Hennecart (jeh)
4a20cb320b