SNOW-1820372: (from 947) when proxy is set in Connection, driver does send traffic through the proxy to S3, but not to Azure blob / GCS bucket (only Snowflake). Works with proxy envvar (GCP)

[sfc-gh-ext-simba-jy]

Description

Please explain the changes you made here.

Checklist

• Format code according to the existing code style (run npm run lint:check -- CHANGED_FILES and fix problems in changed code)
• Create tests which fail without the change (if possible)
• Make all tests (unit and integration) pass (npm run test:unit and npm run test:integration)
• Extend the types in index.d.ts file (if necessary)
• Extend the README / documentation and ensure is properly displayed (if necessary)
• Provide JIRA issue id (if possible) or GitHub issue id in commit message

[codecov]

Codecov Report

Attention: Patch coverage is 84.61538% with 8 lines in your changes missing coverage. Please review.

Project coverage is 89.06%. Comparing base (ea8a0a1) to head (7324fa3).

Files with missing lines	Patch %	Lines
lib/file_transfer_agent/gcs_util.js	84.61%	4 Missing ⚠️
lib/proxy_util.js	69.23%	4 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #982      +/-   ##
==========================================
+ Coverage   88.97%   89.06%   +0.08%     
==========================================
  Files          72       72              
  Lines        6960     6985      +25     
==========================================
+ Hits         6193     6221      +28     
+ Misses        767      764       -3     

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