TODO:
- [x] GPUI2: Implement record_backtrace on executor
- [x] GPUI2: Implement rng on executor
- [x] GPUI2: Determine whether to Implement global notifications for
removals
- [x] Get existing tests passing

TODO later:
- [ ] Port: collab_ui and uncomment tests
- [ ] Port: editor and uncomment tests
- [ ] Port: notifications and uncomment tests



Release Notes:

- N/A