Revert "Site Management Widget: Migrate to react (#39642)" (#39741)

This reverts commit 00a5663.

projects/packages/jetpack-mu-wpcom/src/class-jetpack-mu-wpcom.php

@@ -143,12 +143,12 @@ public static function load_wpcom_user_features() {
 		require_once __DIR__ . '/features/wpcom-admin-interface/wpcom-admin-interface.php';
 		require_once __DIR__ . '/features/wpcom-admin-menu/wpcom-admin-menu.php';
 		require_once __DIR__ . '/features/wpcom-command-palette/wpcom-command-palette.php';
-		require_once __DIR__ . '/features/wpcom-dashboard-widgets/wpcom-dashboard-widgets.php';
 		require_once __DIR__ . '/features/wpcom-locale/sync-locale-from-calypso-to-atomic.php';
 		require_once __DIR__ . '/features/wpcom-plugins/wpcom-plugins.php';
 		require_once __DIR__ . '/features/wpcom-profile-settings/profile-settings-link-to-wpcom.php';
 		require_once __DIR__ . '/features/wpcom-profile-settings/profile-settings-notices.php';
 		require_once __DIR__ . '/features/wpcom-sidebar-notice/wpcom-sidebar-notice.php';
+		require_once __DIR__ . '/features/wpcom-site-management-widget/class-wpcom-site-management-widget.php';
 		require_once __DIR__ . '/features/wpcom-themes/wpcom-themes.php';
 
 		// Only load the Calypsoify and Masterbar features on WoA sites.