MC-18709: [WYSIWYG]Spinner is Always Displayed on Media Gallery popup

- Updated automated test script

Author: Lusine-Papyan

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

@@ -15,12 +15,15 @@
         <waitForElementVisible selector="{{MediaGallerySection.Browse}}" stepKey="waitForBrowseImage"/>
         <click  selector="{{MediaGallerySection.Browse}}" stepKey="clickBrowseImage"/>
         <waitForElementVisible selector="{{MediaGallerySection.StorageRootArrow}}" stepKey="waitForAttacheFiles"/>
+        <waitForLoadingMaskToDisappear stepKey="waitForStorageRootLoadingMaskDisappear"/>
         <click  selector="{{MediaGallerySection.StorageRootArrow}}" stepKey="clickRoot"/>
         <waitForPageLoad stepKey="waitForPageLoad"/>
         <attachFile selector="{{MediaGallerySection.BrowseUploadImage}}" userInput="{{image.file}}" stepKey="attachLogo"/>
         <waitForElementVisible selector="{{MediaGallerySection.InsertFile}}" stepKey="waitForAddSelected"/>
+        <waitForLoadingMaskToDisappear stepKey="waitForLoadingMaskDisappear"/>
         <click  selector="{{MediaGallerySection.InsertFile}}" stepKey="clickAddSelected"/>
         <waitForElementVisible selector="{{MediaGallerySection.OkBtn}}" stepKey="waitForOkButton"/>
+        <waitForLoadingMaskToDisappear stepKey="waitForLoadingMaskToDisappear2"/>
         <click  selector="{{MediaGallerySection.OkBtn}}" stepKey="clickOk"/>
     </actionGroup>
 </actionGroups>