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/import-fresh/index.d.ts

@@ -0,0 +1,30 @@
+/**
+Import a module while bypassing the cache.
+
+@example
+```
+// foo.js
+let i = 0;
+module.exports = () => ++i;
+
+// index.js
+import importFresh = require('import-fresh');
+
+require('./foo')();
+//=> 1
+
+require('./foo')();
+//=> 2
+
+importFresh('./foo')();
+//=> 1
+
+importFresh('./foo')();
+//=> 1
+
+const foo = importFresh<typeof import('./foo')>('./foo');
+```
+*/
+declare function importFresh<T>(moduleId: string): T;
+
+export = importFresh;