Refactor autoloader to remove global variable (https://github.com/woocommerce/woocommerce-admin/pull/6412)

* Remove 1 global from main file

* Add changelog to readme

plugins/woocommerce-admin/readme.txt

@@ -118,6 +118,7 @@ Release and roadmap notes are available on the [WooCommerce Developers Blog](htt
 - Dev: Change `siteUrl` to `homeUrl` on navigation site title #6240
 - Dev: Add navigation favorites data store #6275
 - Add: Add navigation intro modal. #6367
+- Tweak: Refactor autoloader to remove global variable. #6412
 - Fix: Reset Navigation submenu before making Flyout #6396
 - Dev: Add a changelog lint check to PRs. #6414
 - Fix: Move the shipping input and text 1px lower. #6408

plugins/woocommerce-admin/woocommerce-admin.php

@@ -28,9 +28,8 @@ use \Automattic\WooCommerce\Admin\Loader;
  * We want to fail gracefully if `composer install` has not been executed yet, so we are checking for the autoloader.
  * If the autoloader is not present, let's log the failure and display a nice admin notice.
  */
-$autoloader = __DIR__ . '/vendor/autoload_packages.php';
-if ( is_readable( $autoloader ) ) {
-	require $autoloader;
+if ( is_readable( __DIR__ . '/vendor/autoload_packages.php' ) ) {
+	require __DIR__ . '/vendor/autoload_packages.php';
 } else {
 	if ( defined( 'WP_DEBUG' ) && WP_DEBUG ) {
 		error_log(  // phpcs:ignore