SNOW-1629635 fix connection pool allocation

[sfc-gh-mhofman]

Description

Fixed connection pool manager allocation problem
Removal of exceptions related to optional connection string parameters

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

Attention: Patch coverage is 93.29897% with 13 lines in your changes missing coverage. Please review.

Project coverage is 85.68%. Comparing base (aef4d3a) to head (02aedf2).

Files with missing lines	Patch %	Lines
Snowflake.Data/Core/SFBlockingChunkDownloaderV3.cs	95.83%	3 Missing and 3 partials ⚠️
Snowflake.Data/Core/Tools/Diagnostics.cs	87.50%	3 Missing and 2 partials ⚠️
Snowflake.Data/Client/SnowflakeDbConnectionPool.cs	75.00%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1024      +/-   ##
==========================================
- Coverage   85.75%   85.68%   -0.08%     
==========================================
  Files         117      118       +1     
  Lines       11352    11400      +48     
  Branches     1133     1137       +4     
==========================================
+ Hits         9735     9768      +33     
- Misses       1337     1350      +13     
- Partials      280      282       +2     

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