url: update IDNA handling

Remove custom tests for invalid IDNA domains in url-idna.js in favor of
the more comprehensive official set.

PR-URL: https://github.com/nodejs/node/pull/13362
Refs: https://github.com/whatwg/url/pull/309
Refs: https://github.com/w3c/web-platform-tests/pull/5976


Reviewed-By: Refael Ackermann <refack@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Daijiro Wachi <daijiro.wachi@gmail.com>