MAGETWO-96849: [2.3.x] Money are refunded to gift card during partial refund when it's not required

- Add automated test script

Author: Lusine-Papyan

app/code/Magento/Sales/Test/Mftf/Section/AdminCreditMemoTotalSection.xml

@@ -21,5 +21,6 @@
         <element name="submitRefundOffline" type="button" selector=".order-totals-actions button[data-ui-id='order-items-submit-button']" timeout="30"/>
         <element name="creditMemoItem" type="text" selector="#sales_order_view_tabs_order_creditmemos"/>
         <element name="viewMemo" type="text" selector="div#sales_order_view_tabs_order_creditmemos_content a.action-menu-item"/>
+        <element name="refundOffline" type="button"  selector=".order-totals-actions button[data-ui-id='order-items-submit-offline']"/>
     </section>
 </sections>

app/code/Magento/Sales/Test/Mftf/Section/AdminOrderDetailsMainActionsSection.xml

@@ -18,5 +18,6 @@
         <element name="ship" type="button" selector="#order_ship" timeout="30"/>
         <element name="reorder" type="button" selector="#order_reorder" timeout="30"/>
         <element name="edit" type="button" selector="#order_edit" timeout="30"/>
+        <element name="modalOk" type="button" selector=".action-accept"/>
     </section>
 </sections>