Bundle @wordpress/components to avoid styling incompatibilities (#571)

Follows WooCommerce Admin's lead in bundling the @wordpress/components package and pinning to major version 8, rather than depending on the externally loaded instance. This avoids missing styles due to style overrides in WooCommerce Admin combined with changes in WP 5.4.

webpack.config.js

@@ -58,6 +58,8 @@ const webpackConfig = {
 			injectPolyfill: true,
 			requestToExternal( request ) {
 				switch ( request ) {
+					case '@wordpress/components':
+						return null;
 					case '@woocommerce/components':
 						return [ 'wc', 'components' ];
 					case '@woocommerce/currency':
@@ -68,6 +70,8 @@ const webpackConfig = {
 			},
 			requestToHandle( request ) {
 				switch ( request ) {
+					case '@wordpress/components':
+						return null;
 					case '@woocommerce/components':
 						return 'wc-components';
 					case '@woocommerce/currency':