Add collaboration_mode override to turns (#9408)

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

@@ -820,6 +820,7 @@ async fn review_uses_overridden_cwd_for_base_branch_merge_base() {
             model: None,
             effort: None,
             summary: None,
+            collaboration_mode: None,
         })
         .await
         .unwrap();