chore(openai): delete outdated test

[ccurme]

Following #34599, we no longer error on schemas when all arguments have defaults and strict is enabled.

[codspeed-hq]

CodSpeed Performance Report

Merging this PR will not alter performance

_{Comparing cc/delete_openai_test (10878d4) with master (c080296)¹}

Summary

✅ 6 untouched benchmarks
⏩ 28 skipped benchmarks²

Footnotes

1. No successful run was found on master (d972d00) during the generation of this report, so c080296 was used instead as the comparison base. There might be some changes unrelated to this pull request in this report. ↩

2. 28 benchmarks were skipped, so the baseline results were used instead. If they were deleted from the codebase, click here and archive them to remove them from the performance reports. ↩