Require wc-admin-functions into products tracking class (#39030)

* Require wc-admin-functions into products tracking class

* Add changelog

* Revert old change back

plugins/woocommerce/changelog/fix-38996_get_default_options_not_being_loaded

@@ -0,0 +1,4 @@
+Significance: minor
+Type: fix
+
+Add missing require for a wc-admin helper function.

plugins/woocommerce/includes/tracks/events/class-wc-products-tracking.php

@@ -10,6 +10,8 @@ use Automattic\WooCommerce\Internal\Admin\WCAdminAssets;
 
 defined( 'ABSPATH' ) || exit;
 
+require_once WC_ABSPATH . 'includes/admin/wc-admin-functions.php';
+
 /**
  * This class adds actions to track usage of WooCommerce Products.
  */