Allows users to specify a different requirements.txt file to install …

[afourney]

…in Docker, to test other versions or branches of Autogen. Closes #662

Adds a --requirements command line attribute, to specify a different requirements file to install in Docker before running scenarios. This allows you to test on different branches or versions of Autogen.

Why are these changes needed?

Previously, one needed to edit run_scenarios.py to run the testbest on anything other than the most recent stable version of Autogen in PyPI.

Related issue number

Closes #662

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 (c374537) 28.70% compared to head (a704213) 28.70%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #671   +/-   ##
=======================================
  Coverage   28.70%   28.70%           
=======================================
  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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[rickyloynd-microsoft]

Looks good!