openai: Don't send prompt_cache_key for OpenAI-compatible models (#36231)

Some APIs fail when they get this parameter

Closes #36215

Release Notes:

- Fixed OpenAI-compatible providers that don't support prompt caching
and/or reasoning
2a57b160b0Oleksiy Syvokon committed on 8/15/2025, 10:54:24 AM· committed by GitHubparentd891348
8 files changedLine totals unavailable