Clarified error message when GCSIO fails to upload file

[andreigurau]

Made error message more clear when there is an error thrown when GCSIO is uploading a file

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[codecov]

Codecov Report

Merging #24449 (79394c2) into master (fd7e862) will increase coverage by 0.31%.
The diff coverage is 75.00%.

@@            Coverage Diff             @@
##           master   #24449      +/-   ##
==========================================
+ Coverage   73.36%   73.68%   +0.31%     
==========================================
  Files         718      718              
  Lines       97034    98803    +1769     
==========================================
+ Hits        71193    72805    +1612     
- Misses      24511    24668     +157     
  Partials     1330     1330              

Flag	Coverage Δ
python	83.22% <75.00%> (+0.20%)	⬆️

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

Impacted Files	Coverage Δ
sdks/python/apache_beam/io/gcp/gcsio.py	93.66% <75.00%> (+1.53%)	⬆️
sdks/python/apache_beam/io/localfilesystem.py	90.97% <0.00%> (-0.76%)	⬇️
sdks/python/apache_beam/runners/direct/executor.py	96.46% <0.00%> (-0.55%)	⬇️
...ks/python/apache_beam/runners/worker/sdk_worker.py	89.24% <0.00%> (-0.33%)	⬇️
sdks/python/apache_beam/transforms/util.py	96.23% <0.00%> (-0.16%)	⬇️
...hon/apache_beam/runners/worker/bundle_processor.py	93.67% <0.00%> (-0.13%)	⬇️
...examples/inference/pytorch_image_classification.py	0.00% <0.00%> (ø)
...ference/pytorch_image_classification_benchmarks.py	0.00% <0.00%> (ø)
sdks/python/apache_beam/io/filebasedsource.py	99.11% <0.00%> (+0.23%)	⬆️
sdks/python/apache_beam/transforms/core.py	92.90% <0.00%> (+0.36%)	⬆️
... and 5 more

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[johnjcasey]

Run Python PreCommit