Administration: Use wp_admin_notice() for .updated.

Add usages of `wp_admin_notice()` and `wp_get_admin_notice()` on `.updated` in the root level of `/wp-admin/`. Ongoing task to implement new function across core.

Props costdev, joedolson.
See #57791.

git-svn-id: https://develop.svn.wordpress.org/trunk@56573 602fd350-edb4-49c9-b593-d223f7449a82

src/wp-admin/edit-link-form.php

@@ -91,9 +91,18 @@ echo esc_html( $title );
 
 <hr class="wp-header-end">
 
-<?php if ( isset( $_GET['added'] ) ) : ?>
-<div id="message" class="updated notice is-dismissible"><p><?php _e( 'Link added.' ); ?></p></div>
-<?php endif; ?>
+<?php
+if ( isset( $_GET['added'] ) ) {
+	wp_admin_notice(
+		__( 'Link added.' ),
+		array(
+			'id'                 => 'message',
+			'additional_classes' => array( 'updated' ),
+			'dismissible'        => true,
+		)
+	);
+}
+?>
 
 <form name="<?php echo esc_attr( $form_name ); ?>" id="<?php echo esc_attr( $form_name ); ?>" method="post" action="link.php">
 <?php