SNOW-1612981 loglevel for errors Debug -> Error

[sfc-gh-dszmolka]

Description

Debugging #1004 made apparent that it would be more helpful if the errors encountered during communicating with Snowflake would not be 'hidden' under Debug loglevel, as enabling Debug loglevel for the whole driver causes a lot of logs.

Exposing unsuccessful requests at Error loglevel could help see and catch them easier even without needing to enable Debug logs across all the driver.

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 85.61%. Comparing base (7e67f65) to head (44b3c9c).

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1008      +/-   ##
==========================================
+ Coverage   85.56%   85.61%   +0.04%     
==========================================
  Files         106      106              
  Lines       10788    10788              
  Branches     1033     1033              
==========================================
+ Hits         9231     9236       +5     
+ Misses       1310     1304       -6     
- Partials      247      248       +1     

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