Fix truncate copy job when WRITE_TRUNCATE in BigQuery batch load

[Abacn]

Fixes #24535

Due to a typo the original fix did not take effect. Fixed and added a test.

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[Abacn]

R: @robertwb
R: @johnjcasey

We may need another cherry-pick because the original fix, marked as 2.45.0 milestone, did not take effect.

[github-actions]

Stopping reviewer notifications for this pull request: review requested by someone other than the bot, ceding control

[johnjcasey]

We may need to update the comment, as this did not impact the 2.44 release

[codecov]

Codecov Report

Merging #25101 (bb71a53) into master (6203e58) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master   #25101   +/-   ##
=======================================
  Coverage   73.12%   73.12%           
=======================================
  Files         735      735           
  Lines       98153    98161    +8     
=======================================
+ Hits        71776    71785    +9     
+ Misses      25013    25012    -1     
  Partials     1364     1364           

Flag	Coverage Δ
python	82.68% <100.00%> (+<0.01%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
...m/examples/inference/runinference_metrics/setup.py	0.00% <ø> (ø)
...s/python/apache_beam/io/gcp/bigquery_file_loads.py	87.38% <100.00%> (+0.22%)	⬆️
...apache_beam/typehints/native_type_compatibility.py	82.82% <0.00%> (-2.34%)	⬇️
...ks/python/apache_beam/runners/worker/sdk_worker.py	89.08% <0.00%> (-0.17%)	⬇️
sdks/python/apache_beam/transforms/util.py	96.24% <0.00%> (-0.16%)	⬇️
sdks/python/apache_beam/typehints/typehints.py	92.88% <0.00%> (ø)
...hon/apache_beam/runners/worker/bundle_processor.py	93.54% <0.00%> (ø)
...on/apache_beam/runners/dataflow/dataflow_runner.py	81.88% <0.00%> (+0.14%)	⬆️
sdks/python/apache_beam/pipeline.py	92.42% <0.00%> (+0.29%)	⬆️
... and 3 more

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[robertwb]

Thank you!

[Abacn]

@johnjcasey it impacts 2.44.0, and also seen in previous releases. Will try to track since when it is introduced.

It is reported as early as 2.41.0 possibly a long hiden bug but only get exposed as people migrating their batch job to Dataflow runner v2

[Abacn]

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