Open up theme.json processing (#22520)

* Do not require FSE experiment
* Remove the site editor check

lib/global-styles.php

@@ -481,31 +481,14 @@ function gutenberg_experimental_global_styles_enqueue_assets() {
 	wp_enqueue_style( 'global-styles' );
 }
 
-/**
- * Whether the loaded page is the site editor.
- *
- * @return boolean Whether the loaded page is the site editor.
- */
-function gutenberg_experimental_global_styles_is_site_editor() {
-	if ( ! function_exists( 'get_current_screen' ) ) {
-		return false;
-	}
-
-	$screen = get_current_screen();
-	return ! empty( $screen ) && gutenberg_is_edit_site_page( $screen->id );
-}
-
 /**
  * Adds the necessary data for the Global Styles client UI to the block settings.
  *
  * @param array $settings Existing block editor settings.
  * @return array New block editor settings
  */
 function gutenberg_experimental_global_styles_settings( $settings ) {
-	if (
-		! gutenberg_experimental_global_styles_has_theme_json_support() ||
-		! gutenberg_experimental_global_styles_is_site_editor()
-	) {
+	if ( ! gutenberg_experimental_global_styles_has_theme_json_support() ) {
 		return $settings;
 	}
 
@@ -559,8 +542,6 @@ function gutenberg_experimental_global_styles_register_cpt() {
 	register_post_type( 'wp_global_styles', $args );
 }
 
-if ( gutenberg_is_experiment_enabled( 'gutenberg-full-site-editing' ) ) {
-	add_action( 'init', 'gutenberg_experimental_global_styles_register_cpt' );
-	add_filter( 'block_editor_settings', 'gutenberg_experimental_global_styles_settings' );
-	add_action( 'wp_enqueue_scripts', 'gutenberg_experimental_global_styles_enqueue_assets' );
-}
+add_action( 'init', 'gutenberg_experimental_global_styles_register_cpt' );
+add_filter( 'block_editor_settings', 'gutenberg_experimental_global_styles_settings' );
+add_action( 'wp_enqueue_scripts', 'gutenberg_experimental_global_styles_enqueue_assets' );