MC-10833: Resolve TypeScript errors

- Update references from Stage to the RootContainer

Author: davemacaulay

app/code/Magento/PageBuilder/Test/Mftf/Test/AdminCatalogProductPageBuilder.xml

@@ -97,7 +97,7 @@
         <actionGroup ref="dragContentTypeToDropZone" stepKey="dragRowToStage">
             <argument name="contentType" value="PageBuilderRowContentType"/>
             <argument name="contentTypeIndex" value="2"/>
-            <argument name="containerTargetType" value="PageBuilderStage"/>
+            <argument name="containerTargetType" value="PageBuilderRootContainerContentType"/>
             <argument name="dropZoneIndex" value="2"/>
         </actionGroup>
         <!-- Edit 2nd Row -->

app/code/Magento/PageBuilder/Test/Mftf/Test/AdminPageBuilderRowTest.xml

@@ -2055,7 +2055,7 @@
         </actionGroup>
         <actionGroup ref="dragContentTypeToDropZone" stepKey="dragRow2IntoStage">
             <argument name="contentType" value="PageBuilderRowContentType"/>
-            <argument name="containerTargetType" value="PageBuilderStage"/>
+            <argument name="containerTargetType" value="PageBuilderRootContainerContentType"/>
             <argument name="containerTargetIndex" value="1"/>
             <argument name="contentTypeIndex" value="2"/>
             <argument name="dropZoneIndex" value="2"/>