ci(openai_agents): fix asyncio loop missing for sync tests

[sl0thentr0py]

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[github-actions]

Codecov Results 📊

✅ 2307 passed | ⏭️ 243 skipped | Total: 2550 | Pass Rate: 90.47% | Execution Time: 5m 38s

📊 Comparison with Base Branch

Metric	Change
Total Tests	—
Passed Tests	📈 +18
Failed Tests	—
Skipped Tests	📉 -18

✨ No test changes detected

All tests are passing successfully.

✅ Patch coverage is 100.00%. Project has 13401 uncovered lines.
✅ Project coverage is 40.89%. Comparing base (base) to head (head).

Coverage diff

@@            Coverage Diff             @@
##          main       #PR       +/-##
==========================================
+ Coverage    40.84%    40.89%    +0.05%
==========================================
  Files          190       190         —
  Lines        22506     22671      +165
  Branches      8135      7726      -409
==========================================
+ Hits          9191      9270       +79
- Misses       13315     13401       +86
- Partials       525       497       -28

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Cursor Bugbot has reviewed your changes and found 1 potential issue.

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