Include the GCP scope when creating a scoped credential token.

[tvalentyn]

It's recommended to use GCP scope in clients talking to GCP: https://cloud.google.com/compute/docs/access/service-accounts#accesscopesiam . This scope is used in Java SDK: https://github.com/apache/beam/blob/master/sdks/java/extensions/google-cloud-platform-core/src/main/java/org/apache/beam/sdk/extensions/gcp/auth/GcpCredentialFactory.java#L47

[github-actions]

The Workflow run is cancelling this PR. It is an earlier duplicate of 2083803 run.

[tvalentyn]

R: @chamikaramj

[github-actions]

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

[tvalentyn]

Run Python 3.8 postcommit

[tvalentyn]

R: @ricardograca-scratch

[chamikaramj]

LGTM. Thanks.

[chamikaramj]

(also mention in the PR description that this scope is already included for Java SDK).

[codecov]

Codecov Report

Merging #23410 (9a36f53) into master (e53466f) will decrease coverage by 0.00%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master   #23410      +/-   ##
==========================================
- Coverage   73.41%   73.40%   -0.01%     
==========================================
  Files         718      718              
  Lines       95652    95652              
==========================================
- Hits        70222    70216       -6     
- Misses      24119    24125       +6     
  Partials     1311     1311              

Flag	Coverage Δ
python	83.16% <ø> (-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/internal/gcp/auth.py	78.66% <ø> (+5.33%)	⬆️
...ks/python/apache_beam/runners/worker/data_plane.py	87.57% <0.00%> (-1.70%)	⬇️
sdks/python/apache_beam/internal/metrics/metric.py	93.00% <0.00%> (-1.00%)	⬇️
...hon/apache_beam/runners/direct/test_stream_impl.py	93.28% <0.00%> (-0.75%)	⬇️
...eam/runners/portability/fn_api_runner/execution.py	92.44% <0.00%> (-0.65%)	⬇️
...ks/python/apache_beam/runners/worker/sdk_worker.py	88.94% <0.00%> (-0.16%)	⬇️
...hon/apache_beam/runners/worker/bundle_processor.py	93.67% <0.00%> (+0.12%)	⬆️
...eam/runners/interactive/interactive_environment.py	92.02% <0.00%> (+0.30%)	⬆️
sdks/python/apache_beam/utils/interactive_utils.py	97.56% <0.00%> (+2.43%)	⬆️

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[ricardograca-scratch]

Looks like the scope is already there, so this PR isn't actually doing anything.

[chamikaramj]

Yeah, you are right. This would not have any affect.

[ricardograca-scratch]

This PR is adding a line that was already there.

[tvalentyn]

oops, my bad.