Fix nullability suppressor for TestContext when explicit constructor is declared

[Youssef1313]

Fixes #6136

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 74.50%. Comparing base (cd0fd62) to head (8817a49).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #6139      +/-   ##
==========================================
- Coverage   76.92%   74.50%   -2.43%     
==========================================
  Files         619      619              
  Lines       37632    37633       +1     
==========================================
- Hits        28948    28038     -910     
- Misses       8684     9595     +911     

Flag	Coverage Δ
Debug	74.50% <100.00%> (-2.43%)	⬇️
integration	74.50% <100.00%> (-2.43%)	⬇️
production	74.50% <100.00%> (-2.43%)	⬇️
unit	74.50% <100.00%> (-2.43%)	⬇️

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Files with missing lines	Coverage Δ
...rs/NonNullableReferenceNotInitializedSuppressor.cs	85.18% <100.00%> (+0.56%)	⬆️

... and 64 files with indirect coverage changes

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