feat: improve network prover error output

[mattstam]

Removes Twirp references:

Previous:

called Result::unwrap() on an Err value: twirp error: TwirpErrorResponse { code: InvalidArgument, msg: "version is invalid, only 'e48c01ec' is supported - use sp1 commit 'e48c01ec' and try again", meta: {"argument": "version"} }

After change:

called Result::unwrap() on an Err value: error: "InvalidArgument" message: "version is invalid, only 'e48c01ec' is supported - use sp1 commit 'e48c01ec' and try again"

also removing relay usage.