Build/Test Tools: Replace the deprecated @babel/polyfill.

This replaces the dependency of the deprecated `@babel/polyfill` package with the `core-js` package through `@wordpress/babel-preset-default`.

Previously, the file consisted of a generalized group of polyfills, and not all of them were required. This change allows the contents of this file to be built according to the exact needs as dictated by the `@wordpress/babel-preset-default` package, which takes into account the current browser support.

Props gziolo, youknowriad. 
Fixes #52941.

git-svn-id: https://develop.svn.wordpress.org/trunk@51146 602fd350-edb4-49c9-b593-d223f7449a82

package.json

@@ -24,6 +24,7 @@
 		"last 2 Opera versions"
 	],
 	"devDependencies": {
+		"@wordpress/babel-preset-default": "6.2.0",
 		"@wordpress/custom-templated-path-webpack-plugin": "2.0.5",
 		"@wordpress/dependency-extraction-webpack-plugin": "3.1.4",
 		"@wordpress/e2e-test-utils": "5.3.0",
@@ -76,7 +77,6 @@
 		"webpack-livereload-plugin": "2.3.0"
 	},
 	"dependencies": {
-		"@babel/polyfill": "7.10.1",
 		"@wordpress/a11y": "3.1.1",
 		"@wordpress/annotations": "2.1.1",
 		"@wordpress/api-fetch": "5.1.1",

tools/webpack/packages.js

@@ -73,7 +73,7 @@ module.exports = function( env = { environment: 'production', watch: false, buil
 
 	const vendors = {
 		'lodash.js': 'lodash/lodash.js',
-		'wp-polyfill.js': '@babel/polyfill/dist/polyfill.js',
+		'wp-polyfill.js': '@wordpress/babel-preset-default/build/polyfill.js',
 		'wp-polyfill-fetch.js': 'whatwg-fetch/dist/fetch.umd.js',
 		'wp-polyfill-element-closest.js': 'element-closest/element-closest.js',
 		'wp-polyfill-node-contains.js': 'polyfill-library/polyfills/__dist/Node.prototype.contains/raw.js',
@@ -88,7 +88,7 @@ module.exports = function( env = { environment: 'production', watch: false, buil
 
 	const minifiedVendors = {
 		'lodash.min.js': 'lodash/lodash.min.js',
-		'wp-polyfill.min.js': '@babel/polyfill/dist/polyfill.min.js',
+		'wp-polyfill.min.js': '@wordpress/babel-preset-default/build/polyfill.min.js',
 		'wp-polyfill-formdata.min.js': 'formdata-polyfill/formdata.min.js',
 		'wp-polyfill-url.min.js': 'core-js-url-browser/url.min.js',
 		'wp-polyfill-object-fit.min.js': 'objectFitPolyfill/dist/objectFitPolyfill.min.js',