Test optimized generation longbench trust_remote_code=true (#2492)

Fails on MAC:
https://github.com/openvinotoolkit/openvino.genai/actions/runs/16562135998/job/46853033964#step:7:221

Author: as-suvorov

tests/python_tests/test_kv_cache_eviction.py

@@ -220,7 +220,7 @@ def test_optimized_generation_longbench(test_struct):
     generation_config.num_return_sequences = 1
     generation_config.max_new_tokens = max_new_tokens
 
-    data = datasets.load_dataset('THUDM/LongBench', subset, split='test[:32]')
+    data = datasets.load_dataset('THUDM/LongBench', subset, split='test[:32]', trust_remote_code=True)
     with tqdm(total=len(data)) as progress_bar:
         batch = []
         answers = []