Added CLI command for flat rate

Author: Ashish.Kumar18

app/code/Magento/CheckoutAgreements/Test/Mftf/Test/AdminCreateDisabledTextTermEntityTest.xml

@@ -20,6 +20,8 @@
             <group value="mtf_migrated"/>
         </annotations>
         <before>
+            <magentoCLI command="config:set {{EnableFlatRateConfigData.path}} {{EnableFlatRateConfigData.value}}" stepKey="enableFlatRate"/>
+            
             <magentoCLI command="config:set checkout/options/enable_agreements 1" stepKey="setEnableTermsOnCheckout"/>
 
             <createData entity="SimpleTwo" stepKey="createProduct"/>