Remove Claude upsell (#52831)

Self-Review Checklist:

- [ ] I've reviewed my own diff for quality, security, and reliability
- [ ] Unsafe blocks (if any) have justifying comments
- [ ] The content is consistent with the [UI/UX
checklist](https://github.com/zed-industries/zed/blob/main/CONTRIBUTING.md#uiux-checklist)
- [ ] Tests cover the new/changed behavior
- [ ] Performance impact has been considered and is acceptable

Release Notes:

- Removed the (broken) Claude ACP upsell dialogue
4087d9f2caConrad Irwin committed on 4/1/2026, 2:10:05 AM· committed by GitHubparent3b6252c
6 files changedLine totals unavailable