Removed Moq dependency from Instrumentation.SqlClient.Tests

[ngruson]

Related to #4758.

Changes

Refactored SqlEventSourceTests.cs
Removed Moq dependency

[codecov]

Codecov Report

Merging #5125 (13cac44) into main (55f76f6) will increase coverage by 0.04%.
Report is 2 commits behind head on main.
The diff coverage is n/a.

❗ Current head 13cac44 differs from pull request most recent head f5e1744. Consider uploading reports for the commit f5e1744 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #5125      +/-   ##
==========================================
+ Coverage   83.03%   83.08%   +0.04%     
==========================================
  Files         296      296              
  Lines       12320    12320              
==========================================
+ Hits        10230    10236       +6     
+ Misses       2090     2084       -6     

Flag	Coverage Δ
unittests	83.08% <ø> (+0.04%)	⬆️

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see 9 files with indirect coverage changes