plugins: add info.packageJson loader for all plugins

Signed-off-by: Patrik Oldsberg <poldsberg@gmail.com>

plugins/devtools/src/alpha/plugin.tsx

@@ -71,6 +71,7 @@ export const devToolsNavItem = NavItemBlueprint.make({
 /** @alpha */
 export default createFrontendPlugin({
   pluginId: 'devtools',
+  info: { packageJson: () => import('../../package.json') },
   routes: {
     root: convertLegacyRouteRef(rootRouteRef),
   },