chore(core): apply clippy autofix in rollout tests

Remove .clone() from rollout_items.push(RolloutItem::ResponseItem(###.clone())); in codex.rs since ResponseItem already takes ownership of the item, so cloning is unnecessary.

Tests:
- just fix -p codex-core

Author: ignatremizov

codex-rs/core/src/codex.rs

@@ -9601,7 +9601,7 @@ mod tests {
             std::iter::once(&user1),
             reconstruction_turn.truncation_policy,
         );
-        rollout_items.push(RolloutItem::ResponseItem(user1.clone()));
+        rollout_items.push(RolloutItem::ResponseItem(user1));
 
         let assistant1 = ResponseItem::Message {
             id: None,
@@ -9616,7 +9616,7 @@ mod tests {
             std::iter::once(&assistant1),
             reconstruction_turn.truncation_policy,
         );
-        rollout_items.push(RolloutItem::ResponseItem(assistant1.clone()));
+        rollout_items.push(RolloutItem::ResponseItem(assistant1));
 
         let summary1 = "summary one";
         let snapshot1 = live_history
@@ -9643,7 +9643,7 @@ mod tests {
             std::iter::once(&user2),
             reconstruction_turn.truncation_policy,
         );
-        rollout_items.push(RolloutItem::ResponseItem(user2.clone()));
+        rollout_items.push(RolloutItem::ResponseItem(user2));
 
         let assistant2 = ResponseItem::Message {
             id: None,
@@ -9658,7 +9658,7 @@ mod tests {
             std::iter::once(&assistant2),
             reconstruction_turn.truncation_policy,
         );
-        rollout_items.push(RolloutItem::ResponseItem(assistant2.clone()));
+        rollout_items.push(RolloutItem::ResponseItem(assistant2));
 
         let summary2 = "summary two";
         let snapshot2 = live_history