Merge pull request #32529 from backstage/rugvip/disco

frontend-app-api: remove support for experimental package config

packages/frontend-defaults/src/discovery.ts

@@ -26,10 +26,7 @@ interface DiscoveryGlobal {
 }
 
 function readPackageDetectionConfig(config: Config) {
-  // The experimental key is deprecated, but supported still for backwards compatibility
-  const packages =
-    config.getOptional('app.packages') ??
-    config.getOptional('app.experimental.packages');
+  const packages = config.getOptional('app.packages');
   if (packages === undefined || packages === null) {
     return undefined;
   }