Re-commit of #2222: Expanded speaker name matching during speaker selection

[marklysze]

Changes committed as per #2222 to a branch within autogen repository.

Please see #2222 for the reason and code changes / revisions for "Expanded speaker name matching during speaker selection".

Related issue number

This PR replaces #2222.

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 57.02%. Comparing base (2053dd9) to head (5a4aa5e).
Report is 3 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff             @@
##             main    #2267       +/-   ##
===========================================
+ Coverage   37.94%   57.02%   +19.07%     
===========================================
  Files          77       77               
  Lines        7784     7784               
  Branches     1667     1805      +138     
===========================================
+ Hits         2954     4439     +1485     
+ Misses       4580     2958     -1622     
- Partials      250      387      +137     

Flag	Coverage Δ
unittest	14.36% <ø> (?)
unittests	55.87% <ø> (+17.93%)	⬆️

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[ekzhu]

Thanks for the update.

[ekzhu]

OpenAI tests passed except a known flaky test: https://github.com/microsoft/autogen/actions/runs/8544596821/job/23410987268?pr=2267#step:7:137
I think when the response is an error there is no cost.
cc @cheng-tan we can have a separate PR to address it.