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/core-js/internals/math-log2.js

@@ -0,0 +1,10 @@
+'use strict';
+var log = Math.log;
+var LN2 = Math.LN2;
+
+// `Math.log2` method
+// https://tc39.es/ecma262/#sec-math.log2
+// eslint-disable-next-line es/no-math-log2 -- safe
+module.exports = Math.log2 || function log2(x) {
+  return log(x) / LN2;
+};