Verify remaining test projects without Startup class

[Saibamen]

And also test them in SwaggerIntegrationTests.cs

[codecov-commenter]

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 85.89%. Comparing base (8ea0461) to head (f5faaca).

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Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3151      +/-   ##
==========================================
+ Coverage   83.25%   85.89%   +2.63%     
==========================================
  Files          76       79       +3     
  Lines        3142     3296     +154     
  Branches      526      555      +29     
==========================================
+ Hits         2616     2831     +215     
+ Misses        526      465      -61     

Flag	Coverage Δ
Linux	83.29% <ø> (+0.03%)	⬆️
Windows	85.89% <ø> (+2.63%)	⬆️
macOS	83.29% <ø> (+0.03%)	⬆️

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