MC-3725: Unify formatting and style across content types

- update severity of new test

Author: anthoula

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

@@ -375,7 +375,7 @@
             <stories value="Image"/>
             <title value="Image has no required fields in edit form"/>
             <description value="Check there are no required fields in image edit form"/>
-            <severity value="CRITICAL"/>
+            <severity value="AVERAGE"/>
             <useCaseId value="MC-912"/>
             <testCaseId value="MC-3827"/>
             <group value="pagebuilder"/>