Disable very flaky tests (#11394)

Collected from last 20 builds of main in
https://github.com/openai/codex/commits/main/.

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

@@ -45,6 +45,7 @@ fn message_input_texts(body: &Value, role: &str) -> Vec<String> {
 }
 
 #[tokio::test(flavor = "multi_thread", worker_threads = 2)]
+#[ignore = "TODO(aibrahim): flaky"]
 async fn injected_user_input_triggers_follow_up_request_with_deltas() {
     let (gate_completed_tx, gate_completed_rx) = oneshot::channel();