ACP2E-1344: fix failing MC-16186

Author: alzota

app/code/Magento/Sales/Test/Mftf/Test/AdminMassOrdersHoldOnCompleteTest.xml

@@ -19,13 +19,14 @@
             <group value="mtf_migrated"/>
         </annotations>
         <before>
+            <magentoCLI command="config:set {{EnableFlatRateConfigData.path}} {{EnableFlatRateConfigData.value}}" stepKey="enableFlatRate"/>
             <actionGroup ref="AdminLoginActionGroup" stepKey="LoginAsAdmin"/>
-
             <createData entity="Simple_US_Customer" stepKey="createCustomer"/>
             <createData entity="_defaultCategory" stepKey="createCategory"/>
             <createData entity="defaultSimpleProduct" stepKey="createProduct">
                 <requiredEntity createDataKey="createCategory"/>
             </createData>
+            <magentoCLI command="cache:clean config" stepKey="cacheCleanBefore"/>
         </before>
         <after>
             <deleteData createDataKey="createCustomer" stepKey="deleteCustomer"/>