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.date.now.js

@@ -0,0 +1,15 @@
+'use strict';
+// TODO: Remove from `core-js@4`
+var $ = require('../internals/export');
+var uncurryThis = require('../internals/function-uncurry-this');
+
+var $Date = Date;
+var thisTimeValue = uncurryThis($Date.prototype.getTime);
+
+// `Date.now` method
+// https://tc39.es/ecma262/#sec-date.now
+$({ target: 'Date', stat: true }, {
+  now: function now() {
+    return thisTimeValue(new $Date());
+  }
+});