Replace iostream warning message with info

[davorrunje]

Why are these changes needed?

IOStream.get_default function logs a warning when the default is not set for the thread/coroutine. This is changed to an info message as there is no danger of anything breaking.

Related issue number

Mentioned in #2204

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 56.72%. Comparing base (16db0b9) to head (c6808a5).

Additional details and impacted files

@@             Coverage Diff             @@
##             main    #2207       +/-   ##
===========================================
+ Coverage   37.53%   56.72%   +19.18%     
===========================================
  Files          77       77               
  Lines        7710     7711        +1     
  Branches     1655     1791      +136     
===========================================
+ Hits         2894     4374     +1480     
+ Misses       4573     2973     -1600     
- Partials      243      364      +121     

Flag	Coverage Δ
unittest	14.20% <0.00%> (?)
unittests	55.69% <100.00%> (+18.17%)	⬆️

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[afourney]

Discussed on Discord

[jansteh]

How to set default to IOConsole? - So I dont get the constant IOstream warnings?
("No default IOStream has been set, defaulting to IOConsole.")

Or can you please point me to documentation?

No default IOStream has been set, defaulting to IOConsole.
No default IOStream has been set, defaulting to IOConsole.
No default IOStream has been set, defaulting to IOConsole.
←[33massistant←[0m (to user_proxy):

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