Require confirmation before applying state transition for shipments

I'm expecting some tests to fail... But in any case, the attached patch cannot be committed as is... Unless we define our own state transition form (which might be necessary to fix the question that looks a bit ugly)... or we wait for a State machine release to be tagged to include the fix from #3220111: Url route parameters should be merged when redirecting to the confirmation form, otherwise the redirect to the confirmation form crashes due to the missing "commerce_order" parameter.

We need to fix the question (i.e defining our own state transition form and extend getQuestion() but not sure what the question template should be...

The "question" currently says: "Are you sure you want to finalize shipment Shipment #1?"

Wondering if we shouldn't at least, add quotes around the shipment label 'Are you sure you want to finalize shipment "Shipment #1?"'..

Tests should pass now though.

I noticed you already tagged a new state machine release, but I ran into that same issue during translating to Dutch; the order of words is different then. So perhaps better to still fix that in state machine?

Well, whatever we come up with, I don't think we'll find a template that works correctly for all entity types.

I tagged a State machine release because a Commerce release is planned for next wednesday, could have waited a few more days, but wanted to start refactoring commerce_shipping etc.

In any event, this can be altered via code, and the confirmation can be disabled still... So I don't believe we'd need to rush yet another State machine release.

Tests are green, committing!