Handle audio inputs and Bazel unit test arguments (#33929)

## What changed

- Exclude remote and local audio inputs from thread-history searchable text.
- Add a `unit_test_args` option to `codex_rust_crate` and forward it to the
  generated unit-test wrapper.

GitOrigin-RevId: f0aeb7f811163c3c80aa6f8ef4104650e698347c

codex-rs/thread-store/src/local/thread_history/search.rs

@@ -235,6 +235,8 @@ fn searchable_text(item: &ThreadItem) -> Option<Cow<'_, str>> {
                     UserInput::Text { text, .. } => Some(strip_user_message_prefix(text)),
                     UserInput::Image { .. }
                     | UserInput::LocalImage { .. }
+                    | UserInput::Audio { .. }
+                    | UserInput::LocalAudio { .. }
                     | UserInput::Skill { .. }
                     | UserInput::Mention { .. } => None,
                 })