MC-5835: [Sec] XSS in Page Builder

Add explicit type of "string" to addCategoryConditionToProductsBlock's category parameter

Author: danmooney2

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

@@ -77,7 +77,7 @@
     <actionGroup name="addCategoryConditionToProductsBlock">
         <arguments>
             <argument name="page" defaultValue=""/>
-            <argument name="category" defaultValue=""/>
+            <argument name="category" defaultValue="" type="string"/>
             <argument name="conditionIndex" defaultValue="1" type="string"/>
         </arguments>
         <waitForElementVisible selector="{{page.conditionsList}}" stepKey="waitForConditionsToLoad"/>