ACQE-6375:Registered Checkout Using PayPal Smart Button and Flat Rate

Renamed testcase file name

Author: shefalijain-22

app/code/Magento/Paypal/Test/Mftf/Test/RegisteredPaypalCheckoutWithFlatRatePaymentActionSaleTest.xml renamed to app/code/Magento/Paypal/Test/Mftf/Test/StorefrontRegisteredUserPaypalCheckoutWithFlatRatePaymentActionSaleTest.xml

@@ -7,7 +7,7 @@
 -->
 <tests xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
        xsi:noNamespaceSchemaLocation="urn:magento:mftf:Test/etc/testSchema.xsd">
-    <test name="RegisteredPaypalCheckoutWithFlatRatePaymentActionSaleTest">
+    <test name="StorefrontRegisteredUserPaypalCheckoutWithFlatRatePaymentActionSaleTest">
         <annotations>
             <features value="PayPal"/>
             <stories value="Registered Checkout Using PayPal Smart Button and Flat Rate (Payment Action = Sale)"/>