bug fix: fix agent_logging test

[cheng-tan]

Why are these changes needed?

agent_logging test checks the response from the LLM, which might fail in the CI for some configs due to too many requests. This fix checks the error is logged for failed request or the correct chat completion response is logged for successful request.

Related issue number

Checks

• I've included any doc changes needed for https://microsoft.github.io/autogen/. See https://microsoft.github.io/autogen/docs/Contribute#documentation to build and test documentation locally.
• I've added tests (if relevant) corresponding to the changes introduced in this PR.
• I've made sure all auto checks have passed.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 36.90%. Comparing base (8844f86) to head (9329e81).
Report is 3 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2036      +/-   ##
==========================================
- Coverage   36.99%   36.90%   -0.09%     
==========================================
  Files          66       66              
  Lines        7015     7031      +16     
  Branches     1534     1538       +4     
==========================================
  Hits         2595     2595              
- Misses       4194     4210      +16     
  Partials      226      226              

Flag	Coverage Δ
unittests	36.90% <ø> (-0.09%)	⬇️

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[ekzhu]

Can you move this PR to a branch from upstream branch so the open ai tests can run?

[sonichi]

To run the openai test, please make the PR from the upstream repo.