Fixes for flat rate and fixed rate test failures

Author: Manoranjan.Prakash

app/code/Magento/Shipping/Test/Mftf/Test/AdminCheckTheConfirmationPopupTest.xml

@@ -17,9 +17,13 @@
             <group value="shipping"/>
         </annotations>
         <before>
+            <magentoCLI command="config:set {{EnableFlatRateConfigData.path}} {{EnableFlatRateConfigData.value}}" stepKey="enableFlatRate"/>
             <createData entity="Simple_US_Customer" stepKey="createCustomer"/>
             <createData entity="SimpleProduct2" stepKey="createSimpleProduct"/>
             <actionGroup ref="AdminLoginActionGroup" stepKey="LoginAsAdmin"/>
+            <actionGroup ref="CliCacheCleanActionGroup" stepKey="cleanInvalidatedCaches">
+                <argument name="tags" value="config full_page"/>
+            </actionGroup>
         </before>
         <after>
             <deleteData createDataKey="createCustomer" stepKey="deleteCustomer"/>