Replace deprecated @babel/polyfill with `@wordpress/babel-preset-de…

…fault/build/polyfill`

See WordPress/gutenberg#31279
See WordPress/wordpress-develop#1361

assets/src/polyfills/wp-polyfill.js

@@ -1,6 +1,6 @@
 /**
- * External dependencies
+ * WordPress dependencies
  */
-import * as polyfill from '@babel/polyfill';
+import * as polyfill from '@wordpress/babel-preset-default/build/polyfill';
 
 export default polyfill;

package.json

@@ -23,7 +23,6 @@
     "npm": ">= 7"
   },
   "dependencies": {
-    "@babel/polyfill": "7.12.1",
     "@wordpress/api-fetch": "5.1.1",
     "@wordpress/autop": "3.1.1",
     "@wordpress/components": "14.1.2",

webpack.config.js

@@ -159,18 +159,17 @@ const customizer = {
 };
 
 const WORDPRESS_NAMESPACE = '@wordpress/';
-const BABEL_NAMESPACE = '@babel/';
-const gutenbergPackages = [ '@babel/polyfill', '@wordpress/dom-ready', '@wordpress/i18n', '@wordpress/hooks', '@wordpress/html-entities', '@wordpress/url' ].map(
+const gutenbergPackages = [ '@wordpress/polyfill', '@wordpress/dom-ready', '@wordpress/i18n', '@wordpress/hooks', '@wordpress/html-entities', '@wordpress/url' ].map(
 	( packageName ) => {
-		if ( 0 !== packageName.indexOf( WORDPRESS_NAMESPACE ) && 0 !== packageName.indexOf( BABEL_NAMESPACE ) ) {
+		if ( 0 !== packageName.indexOf( WORDPRESS_NAMESPACE ) ) {
 			return null;
 		}
 
 		const camelCaseName = '@wordpress/i18n' === packageName
 			? 'i18n'
-			: camelCaseDash( packageName.replace( WORDPRESS_NAMESPACE, '' ).replace( BABEL_NAMESPACE, '' ) );
+			: camelCaseDash( packageName.replace( WORDPRESS_NAMESPACE, '' ) );
 
-		const handle = packageName.replace( WORDPRESS_NAMESPACE, 'wp-' ).replace( BABEL_NAMESPACE, 'wp-' );
+		const handle = packageName.replace( WORDPRESS_NAMESPACE, 'wp-' );
 
 		return {
 			camelCaseName,