Pretty tool inputs in eval output markdown + numbered assistant messages (#29082)

Release Notes:

- N/A

crates/eval/Cargo.toml

@@ -36,7 +36,6 @@ prompt_store.workspace = true
 release_channel.workspace = true
 reqwest_client.workspace = true
 serde.workspace = true
-serde_json.workspace = true
 settings.workspace = true
 shellexpand.workspace = true
 telemetry.workspace = true