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/caller.js

@@ -0,0 +1,8 @@
+'use strict';
+module.exports = function (methodName, numArgs) {
+  return numArgs === 1 ? function (object, arg) {
+    return object[methodName](arg);
+  } : function (object, arg1, arg2) {
+    return object[methodName](arg1, arg2);
+  };
+};