message: test-utils: Publish alpha types
diff: "publishConfig": {
  "access": "public",
  "main": "dist/index.cjs.js",
  - "types": "dist/index.d.ts"
  + "types": "dist/index.d.ts",
  + "alphaTypes": "dist/index.alpha.d.ts"
  },
  "backstage": {
  "role": "node-library"
  ],
  "license": "Apache-2.0",
  "scripts": {
  - "build": "backstage-cli package build",
  + "build": "backstage-cli package build --experimental-type-build",
  "lint": "backstage-cli package lint",
  "test": "backstage-cli package test",
  "prepack": "backstage-cli package prepack",
  "@backstage/cli": "^0.18.1-next.0"
  },
  "files": [
  - "dist"
  + "dist",
  + "alpha"
  ]
  }
  