changes made as per latest comments

Author: pavan

app/code/Magento/Tax/Test/Mftf/Data/TaxCodeData.xml

@@ -66,6 +66,7 @@
         <data key="rate">5</data>
     </entity>
     <entity name="ProductRateTaxCA" type="tax">
+        <data key="identifier" unique="suffix">Product Rate</data>
         <data key="state">California</data>
         <data key="country">United States</data>
         <data key="zip">*</data>