feat: added totals tests for end 2 end RMA flow (#8906)

what:

I've added some specs and comments in the specs for where I think totals are incorrect. 

Lets get this test merged in as the status quo and proceed to fix these issues one by one.

Additionally, this also removes the temporary_difference as its not something we use. 

RESOLVES CC-346

Co-authored-by: Carlos R. L. Rodrigues <37986729+carlos-r-l-rodrigues@users.noreply.github.com>

packages/modules/order/src/utils/actions/return-item.ts

@@ -4,7 +4,6 @@ import { setActionReference } from "../set-action-reference"
 
 OrderChangeProcessing.registerActionType(ChangeActionType.RETURN_ITEM, {
   isDeduction: true,
-  awaitRequired: true,
   operation({ action, currentOrder, options }) {
     const existing = currentOrder.items.find(
       (item) => item.id === action.details.reference_id