[Hardware][Intel GPU] Add v1 Intel GPU support with Flash attention backend.#19560

WoosukKwon merged 2 commits intovllm-project:mainvllm-project/vllm:mainfrom

jikunshang:kunshang/xpu_v1_flash_attnjikunshang/vllm:kunshang/xpu_v1_flash_attnCopy head branch name to clipboard