AGS - Test Model Component in UI, Compare Sessions

[victordibia]

Why are these changes needed?

• Adds ability to test model clients in UI after configrations, before they are used in agents or teams
• Adds UI side by side comparison of sessions

Related issue number

Closes #4273
Closes #5728

Checks

• 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.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 76.67%. Comparing base (685142c) to head (a96c7e0).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #5963   +/-   ##
=======================================
  Coverage   76.67%   76.67%           
=======================================
  Files         191      191           
  Lines       13141    13141           
=======================================
  Hits        10076    10076           
  Misses       3065     3065           

Flag	Coverage Δ
unittests	76.67% <ø> (ø)

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