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/global-this.js

@@ -0,0 +1,16 @@
+'use strict';
+var check = function (it) {
+  return it && it.Math === Math && it;
+};
+
+// https://github.com/zloirock/core-js/issues/86#issuecomment-115759028
+module.exports =
+  // eslint-disable-next-line es/no-global-this -- safe
+  check(typeof globalThis == 'object' && globalThis) ||
+  check(typeof window == 'object' && window) ||
+  // eslint-disable-next-line no-restricted-globals -- safe
+  check(typeof self == 'object' && self) ||
+  check(typeof global == 'object' && global) ||
+  check(typeof this == 'object' && this) ||
+  // eslint-disable-next-line no-new-func -- fallback
+  (function () { return this; })() || Function('return this')();