chore: fix integrations tests

[Henrrypg]

Fix stale-thread recovery not triggering for OpenAI Responses API

LLMProcessor._call_responses_wrapper catches BadRequestError and checks e.code to detect an expired previous_response_id (previous_response_not_found) so it can clear the stale ID and retry with full history. In practice e.code is unreliable — litellm/openai's exception wiring doesn't consistently populate it across call paths and litellm versions, so the real error code only reliably shows up in the exception message (str(e)).

This caused test_stale_thread_id_triggers_recovery and test_conversation_clean_after_stale_thread_recovery to fail in CI

[openedx-webhooks]

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[Henrrypg]

/integration-test

[Henrrypg]

/integration-test

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 95.32%. Comparing base (1bc8eb6) to head (a32405e).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #239      +/-   ##
==========================================
- Coverage   95.32%   95.32%   -0.01%     
==========================================
  Files          69       69              
  Lines        8090     8089       -1     
  Branches      432      432              
==========================================
- Hits         7712     7711       -1     
  Misses        283      283              
  Partials       95       95              

Flag	Coverage Δ
unittests	95.32% <ø> (-0.01%)	⬇️

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[felipemontoya]

This looks good to me. It also looks good to the integration tests ;)