message: chore: remove frontend plugin command
diff: "start": "backstage-cli plugin:serve",
  "lint": "backstage-cli lint",
  "test": "backstage-cli test",
  - "diff": "backstage-cli plugin:diff",
  "prepack": "backstage-cli prepack",
  "postpack": "backstage-cli postpack",
  "clean": "backstage-cli clean"
  