Fix str(WindowedValueCoder) crash when underlying coder isn't KV coder

[Abacn]

Please add a meaningful description for your change here

Fix #37386

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[gemini-code-assist]

Summary of Changes

Hello @Abacn, 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 addresses a specific crash that occurred when attempting to get the string representation of a WindowedValueCoder instance, particularly when its internal value coder was not a KV coder. The fix involves a minor but critical adjustment to the __repr__ method, ensuring robust behavior regardless of the underlying coder's type and resolving issue #37386.

Highlights

• Fix WindowedValueCoder.__repr__ crash: Corrected the __repr__ method of WindowedValueCoder to prevent crashes when the underlying value coder is not a KV coder. This was achieved by directly referencing the wrapped_value_coder attribute instead of calling value_coder(), which could lead to errors.

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 40.13%. Comparing base (097e90a) to head (f98320f).
⚠️ Report is 54 commits behind head on master.

Additional details and impacted files

@@              Coverage Diff              @@
##             master   #37406       +/-   ##
=============================================
- Coverage     57.12%   40.13%   -16.99%     
  Complexity     3515     3515               
=============================================
  Files          1228     1225        -3     
  Lines        189030   187862     -1168     
  Branches       3656     3656               
=============================================
- Hits         107983    75402    -32581     
- Misses        77626   109039    +31413     
  Partials       3421     3421               

Flag	Coverage Δ
python	39.84% <ø> (-40.95%)	⬇️

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[github-actions]

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R: @shunping for label python.

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[Abacn]

beam_PreCommit_Python_ML passed stuck at publish test results. Not related to this change.