FRE-600: Fix code review blockers

- Consolidated duplicate UndoManagers to single instance
- Fixed connection promise to only resolve on 'connected' status
- Fixed WebSocketProvider import (WebsocketProvider)
- Added proper doc.destroy() cleanup
- Renamed isPresenceInitialized property to avoid conflict

Co-Authored-By: Paperclip <noreply@paperclip.ing>

node_modules/core-js/web/dom-exception.js

@@ -0,0 +1,8 @@
+'use strict';
+require('../modules/es.error.to-string');
+require('../modules/web.dom-exception.constructor');
+require('../modules/web.dom-exception.stack');
+require('../modules/web.dom-exception.to-string-tag');
+var path = require('../internals/path');
+
+module.exports = path.DOMException;