Add a namespace to the click handler registration for `.insert-media` in `media-editor.js`: `click.add-media-button`.

This is a stopgap to allow devs to override the default behavior.

Fixes #23096.


git-svn-id: https://develop.svn.wordpress.org/trunk@29802 602fd350-edb4-49c9-b593-d223f7449a82

src/wp-includes/js/media-editor.js

@@ -1077,7 +1077,7 @@
 		 */
 		init: function() {
 			$(document.body)
-				.on( 'click', '.insert-media', function( event ) {
+				.on( 'click.add-media-button', '.insert-media', function( event ) {
 					var elem = $( event.currentTarget ),
 						editor = elem.data('editor'),
 						options = {