* The "Mark As Won" button should first look for "won stages" that
have a higher sequence than the one the opportunity currently is.
If none is found, then it's "ok" to go to a stage with a lower sequence.
* In Fine, we would like to prevent a "not won" stage to have a higher
sequence than any "is won" stage. But while this is not the case, searching
for the "is won" stage while alterning the sequence order will correctly
handle the following case :
- stage sequence :
[x] [x is won] [y] [y is won] [z] [z is won]
- scenario :
an opportunity in [y] and marked as "won" should go to [y is won].
(not in [x is won] nor [z is won])
Task ID : 2410217
PR : https://github.com/odoo/odoo/pull/63370