[UT] enhance free kv cache block queue popleft_n#24220

zhuohan123 merged 3 commits intovllm-project:mainvllm-project/vllm:mainfrom

andyxning:enhance_free_kv_cache_block_queue_popleft_n_testandyxning/vllm:enhance_free_kv_cache_block_queue_popleft_n_testCopy head branch name to clipboard