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/internals/function-call.js

@@ -0,0 +1,8 @@
+'use strict';
+var NATIVE_BIND = require('../internals/function-bind-native');
+
+var call = Function.prototype.call;
+// eslint-disable-next-line es/no-function-prototype-bind -- safe
+module.exports = NATIVE_BIND ? call.bind(call) : function () {
+  return call.apply(call, arguments);
+};