Merge pull request #19787 from backstage/mob/package-discovery

cli,frontend-app-api: add experimental support for frontend package discovery

packages/app-next/app-config.yaml

@@ -1,5 +1,6 @@
 app:
-  packages: 'all' # ✨
+  experimental:
+    packages: 'all' # ✨
 
 
   # scmAuthExtension: >-

packages/app-next/package.json

@@ -86,6 +86,7 @@
     "@roadiehq/backstage-plugin-github-insights": "^2.0.5",
     "@roadiehq/backstage-plugin-github-pull-requests": "^2.2.7",
     "@roadiehq/backstage-plugin-travis-ci": "^2.0.5",
+    "app-next-example-plugin": "workspace:^",
     "history": "^5.0.0",
     "lodash": "^4.17.21",
     "prop-types": "^15.7.2",