test(openai-agents): Replace mocks with httpx in non-error single-response tests
#6399
| Job | Run time |
|---|---|
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| 3m 40s | |
| 2m 10s | |
| 1m 43s | |
| 1m 46s | |
| 1m 30s | |
| 3m 8s | |
| 3m 6s | |
| 4s | |
| 19m 20s |