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-clamp.js

@@ -0,0 +1,9 @@
+'use strict';
+var aNumber = require('../internals/a-number');
+
+var $min = Math.min;
+var $max = Math.max;
+
+module.exports = function clamp(value, min, max) {
+  return $min($max(aNumber(value), aNumber(min)), aNumber(max));
+};