Fix release-mode integration test compiler failure (#13603)

Addresses #13586

This doesn't affect our CI scripts. It was user-reported.

Summary
- add `wiremock::ResponseTemplate` and `body_string_contains` imports
behind `#[cfg(not(debug_assertions))]` in
`codex-rs/core/tests/suite/view_image.rs` so release builds only pull
the helpers they actually use

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

@@ -41,6 +41,10 @@ use serde_json::Value;
 use tokio::time::Duration;
 use wiremock::BodyPrintLimit;
 use wiremock::MockServer;
+#[cfg(not(debug_assertions))]
+use wiremock::ResponseTemplate;
+#[cfg(not(debug_assertions))]
+use wiremock::matchers::body_string_contains;
 
 fn image_messages(body: &Value) -> Vec<&Value> {
     body.get("input")