Add `lint` script to UI project

ui/package.json

@@ -39,6 +39,7 @@
     "start": "react-scripts start",
     "build": "react-scripts build",
     "test": "react-scripts test",
+    "lint": "eslint -c node_modules/eslint-config-react-app/index.js src/**/*.js",
     "eject": "react-scripts eject",
     "prettier": "prettier --write src/*.js src/**/*.js",
     "check-formatting": "prettier -c src/*.js src/**/*.js"

ui/src/common/MultiLineTextField.test.js

@@ -1,5 +1,5 @@
 import * as React from 'react'
-import { render, cleanup, screen } from '@testing-library/react'
+import { render, cleanup } from '@testing-library/react'
 import { MultiLineTextField } from './MultiLineTextField'
 
 describe('<MultiLineTextField />', () => {

ui/src/utils/formatters.test.js

@@ -1,5 +1,3 @@
-import React from 'react'
-import ReactDOM from 'react-dom'
 import { formatBytes, formatDuration } from './formatters'
 
 describe('formatBytes', () => {