Revert "Fix NameError when pydot is not installed in Beam Playground"

[Abacn]

Reverts #38074

breaks python unit test workflows

We should install pydot in Beam Playground as a fix to #37829

[gemini-code-assist]

Summary of Changes

Hello, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request reverts a previous change that introduced an explicit check for the pydot library. The change was identified as causing regressions in Python unit test workflows, and the intended long-term solution is to ensure pydot is properly installed in the environment instead of handling its absence at runtime.

Highlights

• Reversion of error handling: Removed the explicit NameError check for pydot installation within the pipeline graph construction logic.

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[Abacn]

R: @aIbrahiim

cc: @liferoad

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 56.81%. Comparing base (a1f260b) to head (c13f81e).
⚠️ Report is 13 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff              @@
##             master   #38134      +/-   ##
============================================
- Coverage     56.89%   56.81%   -0.09%     
  Complexity     3428     3428              
============================================
  Files          1178     1182       +4     
  Lines        187520   188470     +950     
  Branches       3593     3593              
============================================
+ Hits         106692   107076     +384     
- Misses        77434    78000     +566     
  Partials       3394     3394              

Flag	Coverage Δ
python	79.61% <ø> (-0.48%)	⬇️

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[Abacn]

R: @claudevdm @ahmedabu98