Removed "Tool Call Id" from main content string.

[afourney]

Why are these changes needed?

Closes #1455

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.

[ekzhu]

I think test in the test_tool_calls.py needs to be updated.

[afourney]

I think test in the test_tool_calls.py needs to be updated.

Yup. Forgot that file. On it.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (2467e97) 33.19% compared to head (2f3bf53) 45.95%.

Additional details and impacted files

@@             Coverage Diff             @@
##             main    #1471       +/-   ##
===========================================
+ Coverage   33.19%   45.95%   +12.76%     
===========================================
  Files          41       41               
  Lines        4950     4948        -2     
  Branches     1135     1201       +66     
===========================================
+ Hits         1643     2274      +631     
+ Misses       3177     2488      -689     
- Partials      130      186       +56     

Flag	Coverage Δ
unittests	45.87% <100.00%> (+12.72%)	⬆️

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