eval_cli: Wait for model discovery (#57038)

Given the model list is dynamic now, we need a wait

Self-Review Checklist:

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

Release Notes:

- N/A
5aeb8a7e0fBen Brandt committed on 5/18/2026, 8:41:02 AM· committed by GitHubparentbfe914b
2 files changedLine totals unavailable