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/modules/es.math.expm1.js

@@ -0,0 +1,8 @@
+'use strict';
+var $ = require('../internals/export');
+var expm1 = require('../internals/math-expm1');
+
+// `Math.expm1` method
+// https://tc39.es/ecma262/#sec-math.expm1
+// eslint-disable-next-line es/no-math-expm1 -- required for testing
+$({ target: 'Math', stat: true, forced: expm1 !== Math.expm1 }, { expm1: expm1 });