language_models: Add thinking support to DeepSeek provider (#32338)

For DeepSeek provider thinking is returned as reasoning_content and we
don't have to send the reasoning_content back in the request.

Release Notes:

- Add thinking support to DeepSeek provider
c75ad2fd11Umesh Yadav committed on 6/9/2025, 9:10:55 AM· committed by GitHubparent365997d
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