MC-4057: Fix attached mftf skipped tests

- Updated assertion syntax
- Added entity for box shadow

Author: Hwashiang Yu

app/code/Magento/PageBuilder/Test/Mftf/Data/CommonContentTypeData.xml

@@ -100,4 +100,17 @@
         <data key="fieldName">appearance</data>
         <data key="value">collage-right</data>
     </entity>
+    <!-- Box Shadow -->
+    <entity name="PageBuilderBoxShadowProperty_Default" type="pagebuilder_box_shadow_property">
+        <data key="name">Box Shadow</data>
+        <data key="value">rgba(153, 153, 153, 0.3) 0px 0px 0px 1px</data>
+    </entity>
+    <entity name="PageBuilderBoxShadowProperty_No_Box_Shadow" type="pagebuilder_box_shadow_property">
+        <data key="name">Box Shadow</data>
+        <data key="value">rgba(153, 153, 153, 0) 0px 0px 0px 1px</data>
+    </entity>
+    <entity name="PageBuilderBoxShadowOnHoverProperty_Default" type="pagebuilder_box_shadow_property">
+        <data key="name">Box Shadow</data>
+        <data key="value">rgb(153, 153, 153) 0px 0px 0px 1px</data>
+    </entity>
 </entities>