Unless ignored on remove_transition

[tayeke]

Context

There is a line in the order class which is supposed to remove the transitions between delivery and confirm contingently on the order confirmation_required? predicate. In practice this line always removes the transition (obvious anytime the payment step is not presented i.e. a $0 order).
https://github.com/spree/spree/blob/af13aaac04754ee37faef0d0121a4938f5c68b63/core/app/models/spree/order.rb#LL74C6-L74C7

There is a commit that seemed to address this issue in 2020, but I can find no evidence that the option unless is implemented in the checkout module. fe90925

Actual Behavior

Confirm step is skipped after delivery step.

Expected Behavior

I would like to see the confirm page before order is complete.

Reproduction Steps

• In order decorator override confirmation_required? to always return true

def confirmation_required?
  true
end

• Create a promotion for free shipping & 100% off of an order
• Create a cart with anything in it and add the 100% off promotion
• Continue through checkout until order is complete