[Misc] [CI/Build] Speed up block manager CPU-only unit tests ~10x by opting-out of GPU cleanup (#3783)

tests/core/block/e2e/conftest.py

@@ -1,25 +1,10 @@
-import contextlib
-import gc
-
 import pytest
-import ray
-import torch
 
+from tests.conftest import cleanup
 from vllm import LLM
-from vllm.model_executor.parallel_utils.parallel_state import (
-    destroy_model_parallel)
 from vllm.model_executor.utils import set_random_seed
 
 
-def cleanup():
-    destroy_model_parallel()
-    with contextlib.suppress(AssertionError):
-        torch.distributed.destroy_process_group()
-    gc.collect()
-    torch.cuda.empty_cache()
-    ray.shutdown()
-
-
 @pytest.fixture
 def baseline_llm_generator(common_llm_kwargs, per_test_common_llm_kwargs,
                            baseline_llm_kwargs, seed):