pool/SNOW-937189 split pool tests

[sfc-gh-knozderko]

Description

Split integration tests for different connection pools.

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 ✅

Comparison is base (af36804) 83.77% compared to head (569c696) 81.50%.

Additional details and impacted files

@@                         Coverage Diff                          @@
##           pool/SNOW-860872-connection-pool     #815      +/-   ##
====================================================================
- Coverage                             83.77%   81.50%   -2.27%     
====================================================================
  Files                                    91       91              
  Lines                                  9313     9313              
  Branches                                857      857              
====================================================================
- Hits                                   7802     7591     -211     
- Misses                                 1279     1482     +203     
- Partials                                232      240       +8     

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