message: packages/cli: fix scaffolded app main and types fields
diff: {
  "name": "plugin-welcome",
  "version": "0.0.0",
  - "main": "dist/cjs/index.js",
  - "types": "dist/cjs/index.d.ts",
  + "main": "dist/index.cjs.js",
  + "types": "dist/index.d.ts",
  "private": true,
  "scripts": {
  "build": "backstage-cli plugin:build",
  