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/kebab-case/index.d.ts

@@ -0,0 +1,9 @@
+type Fn = (str: string) => string;
+
+interface KebabCase extends Fn {
+    reverse: Fn
+}
+
+const kebabCase: KebabCase;
+
+export default kebabCase;