Disable very flaky tests (#11394)

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

codex-rs/state/src/runtime.rs

@@ -1272,6 +1272,7 @@ WHERE id = 1
     }
 
     #[tokio::test]
+    #[ignore = "TODO(jif): flaky"]
     async fn stage1_concurrent_claims_respect_running_cap() {
         let codex_home = unique_temp_dir();
         let runtime = StateRuntime::init(codex_home.clone(), "test-provider".to_string(), None)