Suppress BigQuery read stream splitAtFraction when API busy call or timeout

[Abacn]

Resolve https://github.com/apache/beam/issues/30646#issuecomment-2080102737

• Reject split attempt early when there is an ongoing hasNext call in work item thread

• TImeout hasNext call in splitAtFraction in alignment with client splitReadStreamSettings

The issue exist on both released Beam and after #31096

Tested on read stream API v1 (default) and Dataflow legacy runner in a quota restricted project:

Without the change, the pipeline appears to stuck indefinitely. the onRetryAttempt callback get called periodically.

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[Abacn]

R: @ahmedabu98 (since you reviewed #31096)

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[codecov-commenter]

Codecov Report

Attention: Patch coverage is 53.84615% with 6 lines in your changes missing coverage. Please review.

Project coverage is 60.41%. Comparing base (b34cf54) to head (4b3dd6a). Report is 1077 commits behind head on master.

Files with missing lines	Patch %	Lines
...k/io/gcp/bigquery/BigQueryStorageStreamSource.java	53.84%	6 Missing :warning:

Additional details and impacted files

@@              Coverage Diff              @@
##             master   #31125       +/-   ##
=============================================
- Coverage     71.44%   60.41%   -11.04%     
- Complexity     1474     2981     +1507     
=============================================
  Files           906      659      -247     
  Lines        113271    66095    -47176     
  Branches       1076     3233     +2157     
=============================================
- Hits          80931    39930    -41001     
+ Misses        30327    23066     -7261     
- Partials       2013     3099     +1086     

Flag	Coverage Δ
java	68.62% <53.84%> (+0.04%)	:arrow_up:
python	?

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