SNOW-1756807: Add note about GCP regional endpoints

[sfc-gh-dprzybysz]

Description

SNOW-1756807

Checklist

• Code compiles correctly
• Code is formatted according to Coding Conventions
• Created tests which fail without the change (if possible)
• All tests passing (dotnet test)
• Extended the README / documentation, if necessary
• Provide JIRA issue id (if possible) or GitHub issue id in PR name

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 86.19%. Comparing base (b21bfb3) to head (077c350).
Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1051      +/-   ##
==========================================
- Coverage   86.22%   86.19%   -0.03%     
==========================================
  Files         120      120              
  Lines       11628    11628              
  Branches     1167     1167              
==========================================
- Hits        10026    10023       -3     
- Misses       1321     1326       +5     
+ Partials      281      279       -2     

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