[XPU][Test] Pin block size in test_multi_connector (#51213)

Signed-off-by: zhenwei-intel <zhenwei.liu@intel.com>

.buildkite/intel_jobs/test-intel.yaml

@@ -104,7 +104,7 @@ steps:
         pytest -v -s v1/test_serial_utils.py &&
         VLLM_DISABLE_COMPILE_CACHE=1 pytest -v -s v1/e2e/general/test_correctness_sliding_window.py &&
         pytest -v -s v1/spec_decode --ignore=v1/spec_decode/test_max_len.py --ignore=v1/spec_decode/test_speculators_eagle3.py --ignore=v1/spec_decode/test_acceptance_length.py --ignore=v1/spec_decode/test_speculators_correctness.py &&
-        pytest -v -s v1/kv_connector/unit --ignore=v1/kv_connector/unit/test_multi_connector.py --ignore=v1/kv_connector/unit/test_example_connector.py --ignore=v1/kv_connector/unit/test_lmcache_integration.py --ignore=v1/kv_connector/unit/test_hf3fs_client.py --ignore=v1/kv_connector/unit/test_hf3fs_connector.py --ignore=v1/kv_connector/unit/test_hf3fs_metadata_server.py --ignore=v1/kv_connector/unit/test_offloading_connector.py'
+        pytest -v -s v1/kv_connector/unit --ignore=v1/kv_connector/unit/test_example_connector.py --ignore=v1/kv_connector/unit/test_lmcache_integration.py --ignore=v1/kv_connector/unit/test_hf3fs_client.py --ignore=v1/kv_connector/unit/test_hf3fs_connector.py --ignore=v1/kv_connector/unit/test_hf3fs_metadata_server.py --ignore=v1/kv_connector/unit/test_offloading_connector.py'
   - label: "XPU server test"
     depends_on:
       - image-build-xpu

tests/v1/kv_connector/unit/test_multi_connector.py

@@ -236,6 +236,7 @@ def test_multi_example_connector_consistency():
     llm = LLM(
         model=MODEL_NAME,
         enforce_eager=True,
+        block_size=16,
         gpu_memory_utilization=0.5,
         kv_transfer_config=kv_transfer_config,
         async_scheduling=False,