Add support for using JSX in Nightwatch component tests

[AutomatedTester]

We need to be able to use JSX in tests, e.g.:

import someHandler from './someHandler.js'
import {Button} from './Template.jsx'

describe('example test', function() {
  it('renders <Button/>', function(browser) {
    browser
      .render(<Button onClick={someHandler} />)
      .assert.visile('button')
  }
})

[github-actions[bot]]

Thank you for setting this as an enhancement. One of the product folk will triage this again to help see when we can fit this in an upcoming sprint.