fix permission issue in ags windows

[victordibia]

Why are these changes needed?

Fix permission issue in ags windows (env files now stored in a user directory)

Related issue number

Closes #5355

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]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 76.15%. Comparing base (cf6fa77) to head (62314d6).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #5360   +/-   ##
=======================================
  Coverage   76.15%   76.15%           
=======================================
  Files         158      158           
  Lines        9497     9497           
=======================================
  Hits         7232     7232           
  Misses       2265     2265           

Flag	Coverage Δ
unittests	76.15% <ø> (ø)

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