ENGCOM-7491: Deprecate AbstractAction and it's public methods #27964

 - Merge Pull Request #27964 from lbajsarowicz/magento2:bugfix/deprecate-action
 - Merged commits:
   1. 1759898
   2. 075d377
   3. f5a013e
   4. 90b3785
   5. d857b89

Author: magento-engcom-team

lib/internal/Magento/Framework/App/Action/AbstractAction.php

@@ -1,7 +1,5 @@
 <?php
 /**
- * Abstract redirect/forward action class
- *
  * Copyright © Magento, Inc. All rights reserved.
  * See COPYING.txt for license details.
  */
@@ -10,6 +8,12 @@
 use Magento\Framework\App\RequestInterface;
 use Magento\Framework\App\ResponseInterface;
 
+/**
+ * Abstract redirect/forward action class
+ *
+ * @deprecated Inheritance in controllers should be avoided in favor of composition
+ * @see \Magento\Framework\App\ActionInterface
+ */
 abstract class AbstractAction implements \Magento\Framework\App\ActionInterface
 {
     /**

lib/internal/Magento/Framework/App/Action/Action.php

@@ -23,7 +23,8 @@
  * It contains standard action behavior (event dispatching, flag checks)
  * Action classes that do not extend from this class will lose this behavior and might not function correctly
  *
- * @deprecated Use \Magento\Framework\App\ActionInterface
+ * @deprecated Inheritance in controllers should be avoided in favor of composition
+ * @see \Magento\Framework\App\ActionInterface
  *
  * phpcs:disable Magento2.Classes.AbstractApi
  * @api