MC-37103: Create automated test for "Create order from customer page, free"

Author: mykhailomatiola

app/code/Magento/Sales/Test/Mftf/ActionGroup/AssertAdminFreePaymentActionGroup.xml

@@ -12,6 +12,7 @@
             <description>Checks the free payment on the Admin Create Order page.</description>
         </annotations>
         <click selector="{{AdminOrderFormPaymentSection.linkPaymentOptions}}" stepKey="clickPaymentMethods"/>
+        <waitForAjaxLoad stepKey="waitForPaymentBlockLoad"/>
         <see selector="{{AdminOrderFormPaymentSection.freePaymentLabel}}" userInput="No Payment Information Required" stepKey="checkFreeShipping"/>
     </actionGroup>
 </actionGroups>