MC-27419 : Removed unwanted files

Author: glo74170

app/code/Magento/Checkout/Test/Mftf/ActionGroup/StorefrontGuestSignInActionGroup.xml

@@ -13,7 +13,6 @@
             <description>Enter email id and password, click on sign in button.</description>
         </annotations>
         <arguments>
-            <!--<argument name="username" type="string" defaultValue=""/>-->
             <argument name="email" type="string" defaultValue=""/>
             <argument name="password" type="string" defaultValue=""/>
         </arguments>

app/code/Magento/Checkout/Test/Mftf/Test/StorefrontGuestCheckoutTest/StorefrontShoppingCartGuestCheckoutDisabledTest.xml

@@ -29,9 +29,7 @@
             </createData>
             <!-- create customer and clean the cache and index-->
             <createData entity="Simple_US_Customer" stepKey="createCustomer"/>
-            <comment userInput="Adding the comment to replace CliIndexerReindexActionGroup action group ('indexer:reindex' commands) for preserving Backward Compatibility" stepKey="reindex"/>
-            <comment userInput="Adding the comment to replace CliCacheFlushActionGroup action group ('cache:flush' command) for preserving Backward Compatibility" stepKey="flushCache"/>
-        </before>
+               </before>
         <!-- Goto storefront and add product to cart-->
         <amOnPage url="{{StorefrontCategoryPage.url($$createCategory.custom_attributes[url_key]$$)}}" stepKey="onCategoryPage"/>
         <waitForPageLoad stepKey="waitForPageLoad6"/>