|#1425| +Varun| adding migration script for replacedProductCode in pod_line_items
|#1425| +Varun| populating replacedProductCode in podLineItem from shipmentLineItem and storing in dataBase.
|#1425| +Varun| removing unique constraint from pod_line_item on podId and productCode.
|#1425| +Varun| adding client side code for displaying replacedProductCode on pod screen