Restore empty wp-embed-template-ie.css and enqueue with exempted conditional

Author: joedolson

Gruntfile.js

@@ -644,6 +644,7 @@ module.exports = function(grunt) {
 					// Exceptions.
 					'!wp-includes/css/dashicons.css',
 					'!wp-includes/css/wp-embed-template.css',
+					'!wp-includes/css/wp-embed-template-ie.css'
 				]
 			},
 			colors: {

src/wp-includes/css/wp-embed-template-ie.css

@@ -0,0 +1 @@
+/* Deprecated in WordPress 6.9 */

src/wp-includes/script-loader.php

@@ -1663,6 +1663,8 @@ function wp_default_styles( $styles ) {
 	$styles->add( 'jcrop', '/wp-includes/js/jcrop/jquery.Jcrop.min.css', array(), '0.9.15' );
 	$styles->add( 'colors-fresh', false, array( 'wp-admin', 'buttons' ) ); // Old handle.
 	$styles->add( 'open-sans', $open_sans_font_url ); // No longer used in core as of 4.6.
+	$styles->add( 'wp-embed-template-ie', false );
+	$styles->add_data( 'wp-embed-template-ie', 'conditional', '_required-conditional-dependency_' );
 
 	// Noto Serif is no longer used by core, but may be relied upon by themes and plugins.
 	$fonts_url = '';