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/an-uint8-array.js

@@ -0,0 +1,11 @@
+'use strict';
+var classof = require('../internals/classof');
+
+var $TypeError = TypeError;
+
+// Perform ? RequireInternalSlot(argument, [[TypedArrayName]])
+// If argument.[[TypedArrayName]] is not "Uint8Array", throw a TypeError exception
+module.exports = function (argument) {
+  if (classof(argument) === 'Uint8Array') return argument;
+  throw new $TypeError('Argument is not an Uint8Array');
+};