MC-2258: Automate MFTF

Author: irenelagno

app/code/Magento/PageBuilder/Test/Mftf/ActionGroup/ContentTypeBlockActionGroup.xml

@@ -19,6 +19,7 @@
         <click selector="{{BlockOnGrid.searchBtn}}" stepKey="clickSearchBtn"/>
         <waitForElementVisible selector="{{BlockOnGrid.selectBtn(block.identifier)}}" stepKey="waitForSearchResult"/>
         <click selector="{{BlockOnGrid.selectBtn(block.identifier)}}" stepKey="clickSelectBtn"/>
+        <waitForLoadingMaskToDisappear stepKey="waitForLoadingMaskToDisappear2"/>
         <waitForElementVisible selector="{{BlockOnGrid.addSelectedBtn}}" stepKey="waitForAddSelected"/>
         <click selector="{{BlockOnGrid.addSelectedBtn}}" stepKey="clickAddSelected"/>
     </actionGroup>