[2.4.8-beta2] Downgrade TinyMCE dependency from version 7 to version 6.8.5

Author: jayrangnani-gl

lib/web/mage/adminhtml/wysiwyg/tiny_mce/tinymceAdapter.js

@@ -697,8 +697,8 @@ define([
                 regexEscapedDirectiveUrl = directiveUrl.replace(/([$^.?*!+:=()\[\]{}|\\])/g, '\\$1'),
                 regexDirectiveUrl = regexEscapedDirectiveUrl
                     .replace(
-                        '%directive%',
-                        '([a-zA-Z0-9,_-]+(?:%2[A-Z]|)+\/?)(?:(?!").)*' // eslint-disable-next-line no-useless-escape
+                        '%directive%',// eslint-disable-next-line no-useless-escape
+                        '([a-zA-Z0-9,_-]+(?:%2[A-Z]|)+\/?)(?:(?!").)*'
                     ) + '/?(\\\\?[^"]*)?', // allow optional query string
                 reg = new RegExp(regexDirectiveUrl);