SNOW-969717: Add tests for LOB

[sfc-gh-ext-simba-lf]

Description

Add tests for increased LOB size

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

All modified and coverable lines are covered by tests :white_check_mark:

Comparison is base (fa09941) 83.75% compared to head (e8c6d66) 83.74%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #856 +/- ## ========================================== - Coverage 83.75% 83.74% -0.02% ========================================== Files 89 89 Lines 9344 9344 Branches 861 861 ========================================== - Hits 7826 7825 -1 - Misses 1295 1297 +2 + Partials 223 222 -1 ```

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