Rename X-Revision header to X-Repo-Commit
Align with the convention on the Hub: https://github.com/huggingface/moon-landing/issues/8169#issuecomment-1824620102

Rename X-Revision header to X-Repo-Commit: Align with the convention on the Hub: https://github.com/huggingface/moon-landing/issues/8169#issuecomment-1824620102
