Move Navigation fallback files to 6.3 directory (WordPress#51572)

Author: getdave

lib/experimental/class-wp-classic-to-block-menu-converter.php renamed to lib/compat/wordpress-6.3/class-wp-classic-to-block-menu-converter.php

@@ -47,6 +47,7 @@ function gutenberg_is_experiment_enabled( $name ) {
 	require_once __DIR__ . '/compat/wordpress-6.3/class-gutenberg-rest-templates-controller-6-3.php';
 	require_once __DIR__ . '/compat/wordpress-6.3/class-gutenberg-rest-global-styles-controller-6-3.php';
 	require_once __DIR__ . '/compat/wordpress-6.3/class-gutenberg-rest-global-styles-revisions-controller-6-3.php';
+	require_once __DIR__ . '/compat/wordpress-6.3/class-wp-rest-navigation-fallback-controller.php';
 	require_once __DIR__ . '/compat/wordpress-6.3/rest-api.php';
 	require_once __DIR__ . '/compat/wordpress-6.3/theme-previews.php';
 	require_once __DIR__ . '/compat/wordpress-6.3/navigation-block-preloading.php';
@@ -58,7 +59,6 @@ function gutenberg_is_experiment_enabled( $name ) {
 		require_once __DIR__ . '/experimental/class-wp-rest-customizer-nonces.php';
 	}
 
-	require_once __DIR__ . '/experimental/class-wp-rest-navigation-fallback-controller.php';
 	require_once __DIR__ . '/experimental/rest-api.php';
 }
 
@@ -93,6 +93,7 @@ function gutenberg_is_experiment_enabled( $name ) {
 require __DIR__ . '/compat/wordpress-6.3/html-api/class-gutenberg-html-tag-processor-6-3.php';
 require __DIR__ . '/compat/wordpress-6.3/script-loader.php';
 require __DIR__ . '/compat/wordpress-6.3/blocks.php';
+require __DIR__ . '/compat/wordpress-6.3/navigation-fallback.php';
 
 // Experimental features.
 remove_action( 'plugins_loaded', '_wp_theme_json_webfonts_handler' ); // Turns off WP 6.0's stopgap handler for Webfonts API.
@@ -102,7 +103,7 @@ function gutenberg_is_experiment_enabled( $name ) {
 require __DIR__ . '/experimental/navigation-theme-opt-in.php';
 require __DIR__ . '/experimental/kses.php';
 require __DIR__ . '/experimental/l10n.php';
-require __DIR__ . '/experimental/navigation-fallback.php';
+
 require __DIR__ . '/experimental/interactivity-api/script-loader.php';
 if ( gutenberg_is_experiment_enabled( 'gutenberg-interactivity-api-core-blocks' ) ) {
 	require __DIR__ . '/experimental/interactivity-api/blocks.php';