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.atanh.js

@@ -0,0 +1,18 @@
+'use strict';
+var $ = require('../internals/export');
+
+// eslint-disable-next-line es/no-math-atanh -- required for testing
+var $atanh = Math.atanh;
+var log = Math.log;
+
+var FORCED = !($atanh && 1 / $atanh(-0) < 0);
+
+// `Math.atanh` method
+// https://tc39.es/ecma262/#sec-math.atanh
+// Tor Browser bug: Math.atanh(-0) -> 0
+$({ target: 'Math', stat: true, forced: FORCED }, {
+  atanh: function atanh(x) {
+    var n = +x;
+    return n === 0 ? n : log((1 + n) / (1 - n)) / 2;
+  }
+});