Pool/SNOW-1417631 Disable pooling for jwt token authentication wit key file

[sfc-gh-knozderko]

Description

SNOW-1417631 Disable pooling for jwt token authentication with key file

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

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