Addresses issue 635, relating to newlines in Windows.

[afourney]

Why are these changes needed?

When run_scenarios.py creates the run.sh file on Windows, lines are terminated with \r\n. Docker has trouble when trying to run such files. This PR forces unix newlines, and addresses some other Windows incompatibilities.

Related issue number

Closes #635

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 ✅

Comparison is base (72f488e) 28.70% compared to head (5f478d6) 28.70%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #678   +/-   ##
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  Coverage   28.70%   28.70%           
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  Files          27       27           
  Lines        3383     3383           
  Branches      760      760           
=======================================
  Hits          971      971           
  Misses       2341     2341           
  Partials       71       71           

Flag	Coverage Δ
unittests	28.64% <ø> (ø)

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