Improve File IO Logging

[svetakvsundhar]

When granting IAM permissions to roles/storage.objectUser (or higher) on Google Cloud, the error in question does not surface. Adding a line on IAM permissions in logging, to better the error message.

Note: can't share the code to prove this here since it's proprietary, but happy to demo on a call via sandbox.

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[svetakvsundhar]

R: @AnandInguva (since I saw you recently updated Python File IO). Feel free to reassign if preferred.

[github-actions]

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

[codecov]

Codecov Report

Attention: 1 lines in your changes are missing coverage. Please review.

Comparison is base (c2816c8) 38.38% compared to head (0b00614) 37.82%.
Report is 225 commits behind head on master.

Files	Patch %	Lines
sdks/python/apache_beam/io/fileio.py	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master   #29485      +/-   ##
==========================================
- Coverage   38.38%   37.82%   -0.56%     
==========================================
  Files         687      686       -1     
  Lines      101745   100987     -758     
==========================================
- Hits        39051    38196     -855     
- Misses      61113    61210      +97     
  Partials     1581     1581              

Flag	Coverage Δ
python	29.01% <0.00%> (-0.98%)	⬇️

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[Abacn]

Thanks, LGTM

[Abacn]

The actual error should be emitted from the gcs delete operation. Currently it does not (just return an error code):

beam/sdks/python/apache_beam/io/gcp/gcsio.py

Line 234 in 32b1067

final_results.append((path, error_code))

The GCS migration work long struggled in proper handling errors in batch operation. CC: @shunping