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-trunc.js

@@ -0,0 +1,11 @@
+'use strict';
+var ceil = Math.ceil;
+var floor = Math.floor;
+
+// `Math.trunc` method
+// https://tc39.es/ecma262/#sec-math.trunc
+// eslint-disable-next-line es/no-math-trunc -- safe
+module.exports = Math.trunc || function trunc(x) {
+  var n = +x;
+  return (n > 0 ? floor : ceil)(n);
+};