app-next: complete package discovery example

Co-authored-by: Philipp Hugenroth <philipph@spotify.com>
Co-authored-by: Johan Haals <johan.haals@gmail.com>
Signed-off-by: Patrik Oldsberg <poldsberg@gmail.com>

packages/app-next/app-config.yaml

@@ -1,5 +1,7 @@
 app:
-  packages: 'all' # ✨
+  experimental:
+    # packages: 'all' # ✨
+    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",