SNOW-2158841: Use endpoint over region

[sfc-gh-ext-simba-lf]

Description

Use endpoint over region

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

❌ Patch coverage is 0% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 87.89%. Comparing base (01ffc5a) to head (e0de4cb).
⚠️ Report is 1 commits behind head on master.
✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
...Data/Core/FileTransfer/StorageClient/SFS3Client.cs	0.00%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1204      +/-   ##
==========================================
+ Coverage   86.10%   87.89%   +1.79%     
==========================================
  Files         171      171              
  Lines       14410    14410              
  Branches     1465     1465              
==========================================
+ Hits        12408    12666     +258     
+ Misses       1629     1372     -257     
+ Partials      373      372       -1     

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