Alessio Rocco

[backend] Disable customer returns buttons after first click

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**Description** This PR continue the work started with https://github.com/solidusio/solidus/pull/3342: > It may happen that admin users click multiple times (purposely or not) on submit buttons in the backend area. >...

Double check Order#adjustments are serialized properly according to order object documentation

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Looking at the wombat [order object documenation](https://support.wombat.co/hc/en-us/articles/202555780-Orders) it appears that adjustments are different from those generated by the [order serializer](https://github.com/spree/spree_wombat/blob/2-2-stable/app/serializers/spree/wombat/order_serializer.rb#L47). I've also noticed that in [this issue](https://github.com/spree/hub_gem/commit/3a46e72e5b97d01432496fcd98125f3f7c507894) @huoxito changed this...