MC-38416: Stabilize CMS tests on S3 (#6309)

Author: le0n4ik

app/code/Magento/Cms/Test/Mftf/ActionGroup/NavigateToMediaFolderActionGroup.xml

@@ -15,8 +15,9 @@
         <arguments>
             <argument name="FolderName" type="string"/>
         </arguments>
-        
+
         <conditionalClick selector="{{MediaGallerySection.StorageRootArrow}}" dependentSelector="{{MediaGallerySection.checkIfArrowExpand}}" stepKey="clickArrowIfClosed" visible="true"/>
+        <waitForPageLoad time="10" stepKey="waitForDirectoriesTreeBuilding"/>
         <waitForText userInput="{{FolderName}}" stepKey="waitForNewFolder"/>
         <click userInput="{{FolderName}}" stepKey="clickOnCreatedFolder"/>
         <waitForLoadingMaskToDisappear stepKey="waitForLoading"/>