PB-500 add step key to maintain BC

Author: paras89

app/code/Magento/PageBuilder/Test/Mftf/Test/AdminPageBuilderColumnGridTest/ValidateGridDefaultSizeOnStageTest.xml

@@ -39,6 +39,8 @@
             <argument name="contentType" value="PageBuilderColumnGroupContentType"/>
         </actionGroup>
         <comment userInput="Validate default grid size on initial drop" stepKey="commentValidateInitial"/>
+        <comment userInput="Comment is added to preserve the step key for backward compatibility" stepKey="openGridSizeForm"/>
+        <comment userInput="Comment is added to preserve the step key for backward compatibility" stepKey="seeDefaultGridSize"/>
         <actionGroup ref="updateGridSizeInForm" stepKey="updateGridSizeTo8">
             <argument name="gridSize" value="{{PageBuilderGridSize.defaultGridSize}}"/>
         </actionGroup>

app/code/Magento/PageBuilder/Test/Mftf/Test/AdminPageBuilderColumnGridTest/ValidateInvalidGridSizeErrorTest.xml

@@ -50,6 +50,7 @@
         </actionGroup>
         <!-- Check validation occurs when entering as text -->
         <comment userInput="Check validation occurs when entering as text" stepKey="commentValidateStringInput"/>
+        <comment userInput="Comment is added to preserve the step key for backward compatibility" stepKey="changeInputToText"/>
         <actionGroup ref="updateGridSizeInvalidInForm" stepKey="enterInvalidGridSizeString">
             <argument name="gridSize" value="InvalidString"/>
             <argument name="errorMessage" value="PageBuilderGridSize.invalidNumberErrorMessage"/>

app/code/Magento/PageBuilder/Test/Mftf/Test/AdminPageBuilderColumnGridTest/ValidateUnfocusUpdatesGridTest.xml

@@ -35,6 +35,9 @@
         <actionGroup ref="dragContentTypeToStage" stepKey="dragColumnIntoStage">
             <argument name="contentType" value="PageBuilderColumnGroupContentType"/>
         </actionGroup>
+        <comment userInput="Comment is added to preserve the step key for backward compatibility" stepKey="openGridSizeForm"/>
+        <comment userInput="Comment is added to preserve the step key for backward compatibility" stepKey="enterGridSize"/>
+        <comment userInput="Comment is added to preserve the step key for backward compatibility" stepKey="closeGridFormByClicking"/>
         <actionGroup ref="updateGridSizeInForm" stepKey="updateGridSizeTo8">
             <argument name="gridSize" value="8"/>
         </actionGroup>