MC-13769: Add Missing P0-P1 MFTF Tests For PageBuilder On CMS Block - Render Content Through Block

 - Fixing slide tests rendered through block
 - Adding supporting actiongroup

Author: dhaecker

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

@@ -23,4 +23,7 @@
     <actionGroup name="inlineEditWYSIWYGFromStageForSlideCollageAppearancesInSmallColumns" extends="inlineEditWYSIWYGFromStage">
         <click selector="{{SlideOnBackend.base(index)}}" stepKey="focusOnEditorArea"/>
     </actionGroup>
+    <actionGroup name="validateBackgroundAttributesWithNoImageForSlide" extends="validateBackgroundAttributesWithNoImage">
+        <comment userInput="---merging to remove step---" stepKey="waitForBackgroundAttachment"/>
+    </actionGroup>
 </actionGroups>