Update the shipping checkout flow to show pane summaries on completion completion

This has to wait for the 3.x branch to be opened. We're going to tag a last 2.x with the fix from 🐛 Non draft orders are refreshed when editing shipments Active and then open 3.x.

jsacksick → changed the visibility of the branch 8.x-2.x to hidden.

jsacksick → changed the visibility of the branch 3.x to hidden.

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