Added flat rate line of code

Author: Sahil.kumar

app/code/Magento/Swatches/Test/Mftf/Test/AdminCreateConfigurableProductWithTextSwatchAttributeTest.xml

@@ -18,6 +18,8 @@
             <testCaseId value="AC-5328"/>
         </annotations>
         <before>
+            <!-- Enable Flat Rate -->
+            <magentoCLI command="config:set {{EnableFlatRateConfigData.path}} {{EnableFlatRateConfigData.value}}" stepKey="enableFlatRate"/>
             <!-- create category -->
             <createData entity="ApiCategory" stepKey="createCategory"/>
             <!-- Login to Admin Portal -->