Accept path for work_dir in LocalCommandLineCodeExecutor

[jackgerrits]

Why are these changes needed?

Aligns the interface with other executors in that it can accept a path.

Related issue number

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

Attention: Patch coverage is 91.66667% with 2 lines in your changes are missing coverage. Please review.

Project coverage is 47.67%. Comparing base (e9219fe) to head (b7b4d4b).

Files	Patch %	Lines
autogen/coding/local_commandline_code_executor.py	91.66%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##             main    #1909       +/-   ##
===========================================
+ Coverage   37.09%   47.67%   +10.58%     
===========================================
  Files          64       64               
  Lines        6786     6794        +8     
  Branches     1491     1620      +129     
===========================================
+ Hits         2517     3239      +722     
+ Misses       4061     3291      -770     
- Partials      208      264       +56     

Flag	Coverage Δ
unittests	47.58% <91.66%> (+10.49%)	⬆️

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