ENGCOM-7633: MFTF: Deprecate ActionGroup that should no longer be used #28601

 - Merge Pull Request #28601 from lbajsarowicz/magento2:refactor/mftf-admin-login-action-group
 - Merged commits:
   1. 1948538
   2. 0efe87c

Author: magento-engcom-team

app/code/Magento/User/Test/Mftf/ActionGroup/AdminUserActionGroup.xml renamed to app/code/Magento/User/Test/Mftf/ActionGroup/LoginNewUserActionGroup.xml

@@ -5,10 +5,8 @@
   * See COPYING.txt for license details.
   */
 -->
-<actionGroups xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
-              xsi:noNamespaceSchemaLocation="urn:magento:mftf:Test/etc/actionGroupSchema.xsd">
-    <!--Login New User-->
-    <actionGroup name="LoginNewUser">
+<actionGroups xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:mftf:Test/etc/actionGroupSchema.xsd">
+    <actionGroup name="LoginNewUserActionGroup" deprecated="Use AdminLoginActionGroup instead">
         <annotations>
             <description>Goes to the Backend Admin Login page. Fill Username and Password. Click on Sign In.</description>
         </annotations>