[SqlClient] Delete redundant unused SqlClient integration test

[alanwest]

No CI was configured to run this .NET Framework integration test. We already have another integration test that runs on both .NET and .NET Framework.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 87.60%. Comparing base (71655ce) to head (d7ce250).
Report is 880 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff             @@
##             main    #2842       +/-   ##
===========================================
+ Coverage   73.91%   87.60%   +13.69%     
===========================================
  Files         267        9      -258     
  Lines        9615      460     -9155     
===========================================
- Hits         7107      403     -6704     
+ Misses       2508       57     -2451     

Flag	Coverage Δ
unittests-Instrumentation.SqlClient	87.60% <ø> (?)

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see 270 files with indirect coverage changes

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