zeta_cli: Avoid unnecessary rechecks in `retrieval-stats` (#39267)

Before this change, it would save every buffer and wait for diagnostics.
For rust analyzer this would cause a lot of rechecking and greatly slow
down the analysis

Release Notes:

- N/A

Co-authored-by: Agus <agus@zed.dev>
c61409e577Michael Sloan committed on 10/1/2025, 6:31:27 AM· committed by GitHubparent1659fb8
2 files changedLine totals unavailable