Merge&Retest -> Select and move holdings with items or items to another instance

*Purpose: *
Merge the updates done under UIIN-1098 and re-test the following Scenarios on testing/snapshot,

Scenarios

1. Scenario 1
   • Given an open instance record in Inventory
   • When I select the Action menu
   • Then a new action appears "Move holdings/items to another instance"
2. Scenario 2
   • Given the Action menu in an instance record
   • When I select "Move holdings/items to another instance"
   • Then a search window appears called "Select instance"
3. Scenario 3
   • Given the Select instance search window
   • When I search for a new instance
   • Then results appear
4. Scenario 4
   • Given the Select instance search window
   • When I select an instance from the search results
   • Then a split screen appears showing the original instance on the left and the new instance on the right AND check box and drag-drop icons appear to the left of the items and holdings listed in the original holdings