zeta eval: Improve output (#42629)

Hides the aggregated scores if only one example/repetition ran. It also
fixes an issue with the expected context scoring.

Release Notes:

- N/A
8467a1b08bAgus Zubiaga committed on 11/13/2025, 2:47:48 PM· committed by GitHubparentfb90b12
1 file changedLine totals unavailable