SNOW-984600 Avoid closing expired sessions synchronously with obtaine…

[sfc-gh-knozderko]

…d lock (#830)

Description

Avoid closing expired sessions synchronously with obtained lock

Checklist

• [x] Code compiles correctly
• [x] Code is formatted according to Coding Conventions
• [x] Created tests which fail without the change (if possible)
• [x] All tests passing (dotnet test)
• [x] Extended the README / documentation, if necessary
• [x] Provide JIRA issue id (if possible) or GitHub issue id in PR name

[codecov[bot]]

Codecov Report

Attention: 3 lines in your changes are missing coverage. Please review.

Comparison is base (aaa32fd) 83.48% compared to head (fa4ee81) 83.53%.

Files	Patch %	Lines
Snowflake.Data/Core/Session/SFSession.cs	50.00%	0 Missing and 2 partials :warning:
Snowflake.Data/Core/Session/SessionPool.cs	66.66%	1 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #841 +/- ## ========================================== + Coverage 83.48% 83.53% +0.04% ========================================== Files 89 89 Lines 9188 9189 +1 Branches 841 841 ========================================== + Hits 7671 7676 +5 + Misses 1285 1282 -3 + Partials 232 231 -1 ```

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