Build: Add support for "module" link on QUnit pages

[Krinkle]

First released with QUnit 3.0.0-alpha.4.

Test plan:

• module key is set in cdn.json data for QUnit 3.0.0-alpha.4, not for older releases.
• module link is included on qunit.html for QUnit 3.0.0-alpha.4, not for other releases.

$ npm install && npx grunt build
…
$ less dist/wordpress/resources/cdn.json
$ less dist/wordpress/posts/page/qunit.html

  "qunit": {
    "latestStable": {
      "filename": "qunit/qunit-2.22.0.js",
      "version": "2.22.0",
      "theme": "qunit/qunit-2.22.0.css"
    },
    "all": [
      {
        "filename": "qunit/qunit-3.0.0-alpha.4.js",
        "version": "3.0.0-alpha.4",
        "theme": "qunit/qunit-3.0.0-alpha.4.css",
        "module": "qunit/qunit-3.0.0-alpha.4.module.js"
      },
      {
        "filename": "qunit/qunit-3.0.0-alpha.3.js",
        "version": "3.0.0-alpha.3",
        "theme": "qunit/qunit-3.0.0-alpha.3.css"
      },

<h2>QUnit - All Versions</h2>
<ul>
	<li>
	QUnit 3.0.0-alpha.4 -
	<a
			class='open-sri-modal'
			href='https://code.jquery.com/qunit/qunit-3.0.0-alpha.4.js'
			data-hash='sha256-VKxoHCY02QAnjeQaJ+xYA/kfZTAlzN6n8qP+SDvVI7Y='
		>script</a>,
	<a
			class='open-sri-modal'
			href='https://code.jquery.com/qunit/qunit-3.0.0-alpha.4.module.js'
			data-hash='sha256-XHulKlQYLHGDuBSpNK5BBykG1VB15lfYHlx3iF0nan0='
		>module</a>,
	<a href='https://code.jquery.com/qunit/qunit-3.0.0-alpha.4.css'>stylesheet</a>
</li>
<li>
	QUnit 3.0.0-alpha.3 -
	<a
			class='open-sri-modal'
			href='https://code.jquery.com/qunit/qunit-3.0.0-alpha.3.js'
			data-hash='sha256-cgHZe4kjOb6ZUMVxlAKMr7f5+0CqPxl6GzN32diU2n4='
		>script</a>,
	<a href='https://code.jquery.com/qunit/qunit-3.0.0-alpha.3.css'>stylesheet</a>
</li>
…
<li>
	QUnit 2.22.0 -
	<a
			class='open-sri-modal'
			href='https://code.jquery.com/qunit/qunit-2.22.0.js'
			data-hash='sha256-N4+2khEOiYS4o7WwvBQl0xZlAddyqQYVq5NBnUdugig='
		>script</a>,
	<a href='https://code.jquery.com/qunit/qunit-2.22.0.css'>stylesheet</a>
</li>

Ref qunitjs/qunit#1798.
Ref qunitjs/qunit#1551.