Create a coupon code
use it in a quote A
cancel the quote A
use it in a quote B
confirm B
go back to quote A
set to quotation
confirm

Result: you used the coupon code twice

opw-2410684

closes odoo/odoo#62916

Signed-off-by: agr-odoo <agr-odoo@users.noreply.github.com>

This refactoring extracts parts of `sale_coupon` module to create a more
generic module called `coupon`. This new module can be extended in
different sales modules to implement functionalities specific to modules
that extend it.

Importing addons using the `openerp` anchor is depreciated by #36597

Let's consider a product P with a unit price = 100€
When a price list PL with a discount of 20% was applied, and
a coupon program CP with a discount of 10% was also applied,
system still calculated the rate based on unit price of the product
and not on the discounted price.

So in this example, the amount of the CP discount was 10€ instead of
8€ because the CP discount was computed on the unit price 100€
instead of the discounted price 80€ (with 20% discount of PL)

opw:2006829

X-port/Cherry-pick of odoo/enterprise@23739e8a71b3a107246fdae9f7208dfcd852ca09