FIX:simple fix on tool calling test for anthropic

[SongChiYoung]

Why are these changes needed?

Just simple change.

messages: List[LLMMessage] = [UserMessage(content="Call the pass tool with input 'task'", source="user")]

to

messages: List[LLMMessage] = [UserMessage(content="Call the pass tool with input 'task' and talk result", source="user")]

And, now.
Anthropic model could pass that test case test_model_client_with_function_calling.
-> Yup. Before, claude could not pass that test case.

With this change, Claude (Anthropic) models are now able to pass the test case successfully.

Before this fix, Claude failed to interpret the intent correctly. Now, it can infer both tool usage and follow-up generation.

This change is backward-compatible with other models (e.g., GPT-4) and improves cross-model consistency for function-calling tests.

Checks

x

• I've included any doc changes needed for https://microsoft.github.io/autogen/. See https://github.com/microsoft/autogen/blob/main/CONTRIBUTING.md 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.

[SongChiYoung]

This change highlights how Claude is sensitive to slight variations in prompts when handling function-calling.
It suggests we might be encountering a broader issue related to model-specific prompt tolerance.
Worth keeping in mind as we aim for cross-model consistency.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 89.80%. Comparing base (27da37e) to head (23d56f0).
Report is 1 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff             @@
##             main    #6181       +/-   ##
===========================================
+ Coverage   77.33%   89.80%   +12.47%     
===========================================
  Files         197       35      -162     
  Lines       13808     2571    -11237     
===========================================
- Hits        10679     2309     -8370     
+ Misses       3129      262     -2867     

Flag	Coverage Δ
unittests	89.80% <ø> (+12.47%)	⬆️

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