MQE-2046: remove deprecated entities usages in MFTF tests

Author: jilu1

app/code/Magento/Backend/Test/Mftf/Section/AdminMessagesSection.xml

@@ -9,17 +9,16 @@
 <sections xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
           xsi:noNamespaceSchemaLocation="urn:magento:mftf:Page/etc/SectionObject.xsd">
     <section name="AdminMessagesSection">
-        <!-- Keep both Set1 and Set2 elements -->
-        <!-- Neither Set1 nor Set2 works for all Magento blocks -->
-        <!-- Set1 -->
+        <!-- Keep both sets of elements -->
+        <!-- Set One - more specific, works for most of message blocks -->
         <element name="success" type="text" selector="#messages div.message-success"/>
         <element name="nthSuccess" type="text" selector=".message.message-success.success:nth-of-type({{n}})>div" parameterized="true"/>
         <element name="error" type="text" selector="#messages div.message-error"/>
         <element name="notice" type="text" selector=".message.message-notice.notice"/>
         <element name="messageByType" type="text" selector="#messages div.message-{{messageType}}" parameterized="true" />
         <element name="warning" type="text" selector="#messages div.message-warning"/>
         <element name="accessDenied" type="text" selector=".access-denied-page"/>
-        <!-- Set2 -->
+        <!-- Set Two - more generic, needed for message blocks in Product Import, Staging Update, etc -->
         <element name="successMessage" type="text" selector=".message-success"/>
         <element name="errorMessage" type="text" selector=".message.message-error.error"/>
         <element name="warningMessage" type="text" selector=".message-warning"/>

app/code/Magento/ImportExport/Test/Mftf/Test/AdminImportCSVWithSpecialCharactersTest.xml

@@ -30,6 +30,6 @@
             <argument name="importFile" value="importSpecChars.csv"/>
         </actionGroup>
         <see selector="{{AdminImportHeaderSection.messageNote}}" userInput='File must be saved in UTF-8 encoding for proper import' stepKey="seeNoteMessage"/>
-        <see selector="{{AdminMessagesSection.success}}" userInput='File is valid! To start import process press "Import" button' stepKey="seeSuccessMessage"/>
+        <see selector="{{AdminMessagesSection.successMessage}}" userInput='File is valid! To start import process press "Import" button' stepKey="seeSuccessMessage"/>
     </test>
 </tests>