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/number-is-finite.js

@@ -0,0 +1,11 @@
+'use strict';
+var globalThis = require('../internals/global-this');
+
+var globalIsFinite = globalThis.isFinite;
+
+// `Number.isFinite` method
+// https://tc39.es/ecma262/#sec-number.isfinite
+// eslint-disable-next-line es/no-number-isfinite -- safe
+module.exports = Number.isFinite || function isFinite(it) {
+  return typeof it == 'number' && globalIsFinite(it);
+};