Cherrypick [BEAM-14014] Support impersonation credentials in dataflow runner (#17244)

[y1chi]

Cherrypicks #17244

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[y1chi]

Run Python 3.8 PostCommit

[codecov]

Codecov Report

Merging #17668 (0ebd7c5) into release-2.39.0 (a83cb6a) will increase coverage by 0.03%.
The diff coverage is 78.00%.

@@                Coverage Diff                 @@
##           release-2.39.0   #17668      +/-   ##
==================================================
+ Coverage           73.83%   73.86%   +0.03%     
==================================================
  Files                 691      691              
  Lines               91249    91557     +308     
==================================================
+ Hits                67371    67631     +260     
- Misses              22650    22698      +48     
  Partials             1228     1228              

Flag	Coverage Δ
python	83.68% <78.00%> (+<0.01%)	⬆️

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/bigquery_tools.py	83.15% <ø> (+0.17%)	⬆️
...ks/python/apache_beam/runners/interactive/utils.py	95.41% <ø> (ø)
..._beam/runners/portability/sdk_container_builder.py	37.93% <0.00%> (ø)
...apache_beam/runners/dataflow/internal/apiclient.py	77.39% <50.00%> (+0.03%)	⬆️
sdks/python/apache_beam/internal/gcp/auth.py	78.66% <76.92%> (-2.37%)	⬇️
sdks/python/apache_beam/io/gcp/gcsfilesystem.py	88.65% <82.35%> (+0.41%)	⬆️
sdks/python/apache_beam/io/gcp/gcsio.py	92.26% <100.00%> (ø)
...dks/python/apache_beam/options/pipeline_options.py	94.93% <100.00%> (+0.01%)	⬆️
sdks/python/apache_beam/coders/row_coder.py	94.49% <0.00%> (-2.65%)	⬇️
sdks/python/apache_beam/runners/common.py	87.94% <0.00%> (-2.33%)	⬇️
... and 17 more

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