Revert "Move WebAPI test to the correct folder"

This reverts commit b42125f.

Author: svera

dev/tests/api-functional/testsuite/Magento/GraphQl/PageCache/DisableSessionTest.php renamed to dev/tests/Magento/GraphQl/PageCache/DisableSessionTest.php

@@ -16,9 +16,9 @@
 
 namespace Magento\GraphQl\PageCache;
 
-use Magento\Framework\App\PageCache\Version;
-use Magento\TestFramework\Fixture\Config;
 use Magento\TestFramework\TestCase\GraphQlAbstract;
+use Magento\TestFramework\Fixture\Config;
+use Magento\Framework\App\PageCache\Version;
 
 /**
  * Test absence/presence of private_content_version cookie in GraphQl POST HTTP responses