CI test linux://python/ray/llm/tests:batch/gpu/processor/test_vllm_engine_proc is consistently_failing

[aslonnie]

CI test linux://python/ray/llm/tests:batch/gpu/processor/test_vllm_engine_proc is consistently_failing. Recent failures:
- https://buildkite.com/ray-project/postmerge/builds/15144#019b71d3-b483-41fa-a6a9-dc1a08abda8a
- https://buildkite.com/ray-project/postmerge/builds/15144#019b7166-6b8f-4910-a6a2-85dc243edfb4

DataCaseName-linux://python/ray/llm/tests:batch/gpu/processor/test_vllm_engine_proc-END
Managed by OSS Test Policy

[aslonnie]

This test is now considered as flaky because it has been failing on postmerge for too long. Flaky tests do not run on premerge.

[aslonnie]

seems fixed?