CTS tests with langgraph caused memory exhaustion in the machine. #222

I ran all CTS tests with langgraph runtime.
After 3-4 hrs run in machine with 32 GB RAM, the machine's memory got exhausted.

Simply ran: python -m pytest -s -v -rA conformance_test_suite/tests.

Meanwhile, same tests ended gracefully with wayflow, hence issue is in the langgraph runtime.

I have attached the snapshots.