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/@babel/code-frame/README.md

@@ -0,0 +1,19 @@
+# @babel/code-frame
+
+> Generate errors that contain a code frame that point to source locations.
+
+See our website [@babel/code-frame](https://babeljs.io/docs/babel-code-frame) for more information.
+
+## Install
+
+Using npm:
+
+```sh
+npm install --save-dev @babel/code-frame
+```
+
+or using yarn:
+
+```sh
+yarn add @babel/code-frame --dev
+```