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/@babel/runtime/helpers/checkInRHS.js

@@ -0,0 +1,6 @@
+var _typeof = require("./typeof.js")["default"];
+function _checkInRHS(e) {
+  if (Object(e) !== e) throw TypeError("right-hand side of 'in' should be an object, got " + (null !== e ? _typeof(e) : "null"));
+  return e;
+}
+module.exports = _checkInRHS, module.exports.__esModule = true, module.exports["default"] = module.exports;