Use shorthand Fragment syntax everywhere

[swissspidy]

This removes the need for explicit imports, as these are handled by Babel.

This has been made possible by an upstream change in Gutenberg, see WordPress/gutenberg#15120. Example:

function MyComponent( props ) {
  return <>
    <h1>Hello!</h1>
    <h2>👋</h2>
  </>;
}

/* ⬇️ After transform ⬇️ */

import { createElement, Fragment } from '@wordpress/element';
function MyComponent( props ) {
  return <>
    <h1>Hello!</h1>
    <h2>👋</h2>
  </>;
}

[miina]

Awesome! Seems to work as expected.