fix: render editor tabs if SHOW_UPCOMING_CHANGES is 'true' (#39513)

config/env.js

@@ -19,7 +19,8 @@ const {
   ALGOLIA_APP_ID: algoliaAppId,
   ALGOLIA_API_KEY: algoliaAPIKey,
   PAYPAL_CLIENT_ID: paypalClientId,
-  DEPLOYMENT_ENV: deploymentEnv
+  DEPLOYMENT_ENV: deploymentEnv,
+  SHOW_UPCOMING_CHANGES: showUpcomingChanges
 } = process.env;
 
 const locations = {
@@ -48,5 +49,6 @@ module.exports = Object.assign(locations, {
   paypalClientId:
     !paypalClientId || paypalClientId === 'id_from_paypal_dashboard'
       ? null
-      : paypalClientId
+      : paypalClientId,
+  showUpcomingChanges: showUpcomingChanges === 'true'
 });