message: Add clean script to template plugin
diff: "scripts": {
  "build": "backstage-cli plugin:build",
  "lint": "backstage-cli lint",
  - "test": "backstage-cli test"
  + "test": "backstage-cli test",
  + "clean": "backstage-cli clean"
  },
  "devDependencies": {
  "@backstage/cli": "^{{version}}",
  