Comments: Announce reply notices to screen reader users.

Improve experience for screen reader users by calling `wp.a11y.speak()` with the results of comment reply submissions within the WordPress dashboard.

Props joedolson, khokansardar.
Fixes #61480.


git-svn-id: https://develop.svn.wordpress.org/trunk@58931 602fd350-edb4-49c9-b593-d223f7449a82

src/js/_enqueues/admin/edit-comments.js

@@ -1188,6 +1188,7 @@ window.commentReply = {
 		if ( er ) {
 			$errorNotice.removeClass( 'hidden' );
 			$error.html( er );
+			wp.a11y.speak( er );
 		}
 	},
 

src/wp-includes/script-loader.php

@@ -1397,7 +1397,7 @@ function wp_default_scripts( $scripts ) {
 		$scripts->add( 'admin-tags', "/wp-admin/js/tags$suffix.js", array( 'jquery', 'wp-ajax-response' ), false, 1 );
 		$scripts->set_translations( 'admin-tags' );
 
-		$scripts->add( 'admin-comments', "/wp-admin/js/edit-comments$suffix.js", array( 'wp-lists', 'quicktags', 'jquery-query' ), false, 1 );
+		$scripts->add( 'admin-comments', "/wp-admin/js/edit-comments$suffix.js", array( 'wp-lists', 'quicktags', 'jquery-query', 'wp-a11y' ), false, 1 );
 		$scripts->set_translations( 'admin-comments' );
 		did_action( 'init' ) && $scripts->localize(
 			'admin-comments',