open_ai: Send `prompt_cache_key` to improve caching (#36065)

Release Notes:

- N/A

Co-authored-by: Michael Sloan <mgsloan@gmail.com>
7167f193c0Oleksiy Syvokon committed on 8/12/2025, 6:51:23 PM· committed by GitHubparent7ff0f15
2 files changedLine totals unavailable