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/fb-dotslash/index.d.ts

@@ -0,0 +1,14 @@
+/**
+ * Copyright (c) Meta Platforms, Inc. and affiliates.
+ *
+ * This source code is dual-licensed under either the MIT license found in the
+ * LICENSE-MIT file in the root directory of this source tree or the Apache
+ * License, Version 2.0 found in the LICENSE-APACHE file in the root directory
+ * of this source tree. You may select, at your option, one of the
+ * above-listed licenses.
+ *
+ * @format
+ */
+
+declare const binaryPath: string;
+export = binaryPath;