fix: warn when using reflection on tool use with Claude models

[ekzhu]

Resolves #5731

[victordibia]

Thanks

[codecov]

Codecov Report

Attention: Patch coverage is 50.00000% with 1 line in your changes missing coverage. Please review.

Project coverage is 75.58%. Comparing base (92d857f) to head (07c9201).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
...t/src/autogen_agentchat/agents/_assistant_agent.py	50.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #5829      +/-   ##
==========================================
- Coverage   75.58%   75.58%   -0.01%     
==========================================
  Files         189      189              
  Lines       12669    12671       +2     
==========================================
+ Hits         9576     9577       +1     
- Misses       3093     3094       +1     

Flag	Coverage Δ
unittests	75.58% <50.00%> (-0.01%)	⬇️

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