Improve failure message when passing Pipeline object / PBegin objects…

[TanuSharma2511]

… (resolves #34703)

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[codecov]

Codecov Report

Attention: Patch coverage is 50.00000% with 2 lines in your changes missing coverage. Please review.

Project coverage is 56.55%. Comparing base (cad045b) to head (37d7e2a).
Report is 152 commits behind head on master.

Files with missing lines	Patch %	Lines
sdks/python/apache_beam/transforms/ptransform.py	50.00%	2 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master   #34716      +/-   ##
============================================
+ Coverage     56.42%   56.55%   +0.13%     
  Complexity     3285     3285              
============================================
  Files          1177     1179       +2     
  Lines        180098   180756     +658     
  Branches       3398     3398              
============================================
+ Hits         101620   102234     +614     
- Misses        75216    75260      +44     
  Partials       3262     3262              

Flag	Coverage Δ
python	81.26% <50.00%> (+0.10%)	⬆️

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[hjtran]

This error message is much better!

I think when we're catching the exception here is a little late though, and this error message probably won't apply for all calls to get_windowing.

It might make sense to catch the issue immediately when we apply the PIpeline/PBegin object rather than when we attempt to run the pipeline. I think this could be done by modifying PTransform.__ror__. This would also minimize the risk that we raise this error message when it doesn't actually apply