ep: Combine PredictionProvider and ZetaVersion (#46896)

We can specify prompt version in the provider name itself, like this
`--provider zeta2:0113`.

This kind of tag will also be stored in the `provider` field of
jsonlines files.

This drops the `--version` parameter.


Release Notes:

- N/A
a10fdfd2b8Oleksiy Syvokon committed on 1/15/2026, 5:00:21 PM· committed by GitHubparent3ed6c68
4 files changedLine totals unavailable