SNOW-1781419: 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 (Azure)

[sfc-gh-ext-simba-jy]

Description

Please explain the changes you made here.

• Added the proxy setting in Azure_util
• Separate the proxy util functions from util.js. Created proxy_util.js and proxy_util_test.js
• Added connectionConfig in AzureUtil tests.
• Refactored the code to validate and obtain proxy info in NoteHttpClient, Azure_util, and S3_util.

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 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 89.58333% with 15 lines in your changes missing coverage. Please review.

Project coverage is 88.83%. Comparing base (a714851) to head (d65674b).
Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
lib/proxy_util.js	90.83%	11 Missing ⚠️
lib/file_transfer_agent/azure_util.js	66.66%	4 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #964      +/-   ##
==========================================
- Coverage   88.94%   88.83%   -0.11%     
==========================================
  Files          70       71       +1     
  Lines        6830     6889      +59     
==========================================
+ Hits         6075     6120      +45     
- Misses        755      769      +14     

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