openai[patch]: accommodate change in image generation API

[ccurme]

OpenAI changed their API to require the partial_images parameter when using image generation + streaming.

As described in #31424, we are ignoring partial images. Here, we accept the partial_images parameter (as required by OpenAI), but emit a warning and continue to ignore partial images.

[vercel]

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1 Skipped Deployment

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[codspeed-hq]

CodSpeed Walltime Performance Report

Merging #31522 will not alter performance

_{Comparing cc/oai_fix_streaming_images (fe6416e) with master (ece9e31)}

⚠️ Unknown Walltime execution environment detected

Using the Walltime instrument on standard Hosted Runners will lead to inconsistent data.

For the most accurate results, we recommend using CodSpeed Macro Runners: bare-metal machines fine-tuned for performance measurement consistency.

Summary

✅ 13 untouched benchmarks

[codspeed-hq]

CodSpeed Instrumentation Performance Report

Merging #31522 will not alter performance

_{Comparing cc/oai_fix_streaming_images (fe6416e) with master (ece9e31)}

Summary

✅ 13 untouched benchmarks