Global Styles on Personal: Added feature check to marketing bar (#40068)

* Added a feature check for the GS on Personal plan feature on the marketing bar

* changelog

* Fixed code styles

* Fixed codestyle

* Added missing variable use

Committed via a GitHub action: https://github.com/Automattic/jetpack/actions/runs/11720894771

Upstream-Ref: Automattic/jetpack@c1215ca

CHANGELOG.md

@@ -10,6 +10,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 This is an alpha version! The changes listed here are not final.
 
 ### Added
+- Added a feature check to the Marketing Bar that updates the text and upgrade link for Global Styles
 - Enable test coverage.
 - Help Center: add new rest route for support interactions
 

src/features/wpcom-global-styles/index.php

@@ -451,7 +451,13 @@ function wpcom_display_global_styles_launch_bar( $bar_controls ) {
 		$site_slug = wp_parse_url( $home_url, PHP_URL_HOST );
 	}
 
-	$upgrade_url = "https://wordpress.com/plans/$site_slug?plan=value_bundle&feature=style-customization";
+	// @TODO Remove this once the global styles are available for all users on the Personal Plan.
+	$gs_upgrade_plan = WPCOM_VALUE_BUNDLE;
+	$upgrade_url     = "https://wordpress.com/plans/$site_slug?plan=value_bundle&feature=style-customization";
+	if ( class_exists( 'WPCOM_Feature_Flags' ) && WPCOM_Feature_Flags::is_enabled( WPCOM_Feature_Flags::GLOBAL_STYLES_ON_PERSONAL_PLAN ) ) {
+		$gs_upgrade_plan = WPCOM_PERSONAL_BUNDLE;
+		$upgrade_url     = "https://wordpress.com/plans/$site_slug?plan=personal-bundle&feature=style-customization";
+	}
 
 	if ( wpcom_is_previewing_global_styles() ) {
 		$preview_location = add_query_arg( 'hide-global-styles', '' );
@@ -500,7 +506,7 @@ function wpcom_display_global_styles_launch_bar( $bar_controls ) {
 							'jetpack-mu-wpcom'
 						),
 						$support_url,
-						get_store_product( WPCOM_VALUE_BUNDLE )->product_name
+						get_store_product( $gs_upgrade_plan )->product_name
 					);
 					printf(
 						wp_kses(