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/modules/es.object.get-own-property-names.js

@@ -0,0 +1,13 @@
+'use strict';
+var $ = require('../internals/export');
+var fails = require('../internals/fails');
+var getOwnPropertyNames = require('../internals/object-get-own-property-names-external').f;
+
+// eslint-disable-next-line es/no-object-getownpropertynames -- required for testing
+var FAILS_ON_PRIMITIVES = fails(function () { return !Object.getOwnPropertyNames(1); });
+
+// `Object.getOwnPropertyNames` method
+// https://tc39.es/ecma262/#sec-object.getownpropertynames
+$({ target: 'Object', stat: true, forced: FAILS_ON_PRIMITIVES }, {
+  getOwnPropertyNames: getOwnPropertyNames
+});