Fix multi-environment unified exec test wait

The submit helper already waits for the turn to complete. Remove the second wait so the test can inspect the captured request after the successful selected-environment tool call.

Co-authored-by: Codex <noreply@openai.com>

codex-rs/core/tests/suite/unified_exec.rs

@@ -397,11 +397,6 @@ async fn unified_exec_environment_id_targets_non_primary_environment() -> Result
     )
     .await?;
 
-    wait_for_event(&test.codex, |event| {
-        matches!(event, EventMsg::TurnComplete(_))
-    })
-    .await;
-
     let bodies = request_log
         .requests()
         .into_iter()