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/acorn-jsx/index.d.ts

@@ -0,0 +1,12 @@
+import { Parser } from 'acorn' 
+
+declare const jsx: (options?: jsx.Options) => (BaseParser: typeof Parser) => typeof Parser;
+
+declare namespace jsx {
+  interface Options {
+    allowNamespacedObjects?: boolean;
+    allowNamespaces?: boolean;
+  }
+}
+
+export = jsx;