MC-4866: Convert DeleteStoreGroupEntityTest to MFTF

Addressing review comments

Author: sapanathakur

app/code/Magento/Store/Test/Mftf/ActionGroup/DeleteCustomStoreActionGroup.xml

@@ -23,7 +23,6 @@
         <selectOption userInput="No" selector="{{AdminStoresDeleteStoreGroupSection.createDbBackup}}" stepKey="setCreateDbBackupToNo"/>
         <click selector="{{AdminStoresDeleteStoreGroupSection.deleteStoreGroupButton}}" stepKey="clickDeleteStoreGroupButtonOnDeleteStorePage"/>
     </actionGroup>
-    <!--AssertStoreGroupSuccessDeleteAndBackupMessages-->
     <actionGroup name="DeleteCustomStoreBackupEnabledYesActionGroup">
         <arguments>
             <argument name="storeGroupName" type="string"/>
@@ -41,7 +40,6 @@
         <see selector="{{AdminStoresGridSection.successMessage}}" userInput="The database was backed up." stepKey="seeAssertDatabaseBackedUpMessage"/>
         <see selector="{{AdminStoresGridSection.successMessage}}" userInput="You deleted the store." stepKey="seeAssertSuccessDeleteStoreGroupMessage"/>
     </actionGroup>
-    <!--AssertStoreGroupNotInGrid-->
     <actionGroup name="AssertStoreNotInGrid">
         <arguments>
             <argument name="storeGroupName" type="string"/>

app/code/Magento/Store/Test/Mftf/Test/AdminDeleteStoreGroupTest.xml

@@ -33,19 +33,20 @@
             <actionGroup ref="logout" stepKey="logout"/>
         </after>
 
-        <!--AssertStoreGroupSuccessDeleteAndBackupMessages-->
+        <!--Delete custom store group and verify AssertStoreGroupSuccessDeleteAndBackupMessages-->
         <actionGroup ref="DeleteCustomStoreBackupEnabledYesActionGroup" stepKey="deleteCustomStoreGroup">
             <argument name="storeGroupName" value="{{customStore.name}}"/>
         </actionGroup>
 
-        <!--AssertStoreGroupNotInGrid-->
+        <!--Verify deleted Store group is not present in grid and verify AssertStoreGroupNotInGrid message-->
         <actionGroup ref="AssertStoreNotInGrid" stepKey="verifyDeletedStoreGroupNotInGrid">
             <argument name="storeGroupName" value="{{customStore.name}}"/>
         </actionGroup>
 
-        <!--Go to backup index page, verify AssertBackupInGrid-->
+        <!--Go to backup index page and verify AssertBackupInGrid-->
         <amOnPage url="{{BackupIndexPage.url}}" stepKey="goToBackupIndexPage"/>
         <waitForPageLoad stepKey="waitForBackupIndexPageLoad"/>
+        <see selector="{{AdminGridTableSection.backupNameColumn}}" userInput="{{WebSetupWizardBackup.name}}" stepKey="seeBackupInGrid"/>
         <!--Delete database backup-->
         <actionGroup ref="deleteBackup" stepKey="deleteDatabaseBackup">
             <argument name="backup" value="WebSetupWizardBackup"/>