Improve mutation tests performance by ensuring solution file isn't discovered

[slang25]

I was doing some testing locally and I've noticed that what is happening with the Cake build script is that when mutation tests are triggered, because they are launched from the root of the repo, the solution file is automatically detected which causes all tests to run.

This should limit each mutation test to only run the tests from the matching project.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 96.23%. Comparing base (e15a4a0) to head (f47cc29).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2589   +/-   ##
=======================================
  Coverage   96.23%   96.23%           
=======================================
  Files         311      311           
  Lines        7327     7327           
  Branches     1013     1013           
=======================================
  Hits         7051     7051           
  Misses        222      222           
  Partials       54       54           

Flag	Coverage Δ
linux	96.23% <ø> (ø)
macos	96.23% <ø> (ø)
windows	96.22% <ø> (ø)

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[martincostello]

Nice find - feels like a bit of a footgun on the part of Stryker to do that given that it was given a specific project, but 10 minutes less runtime is a definite improvement.

[github-actions]

Thanks for your contribution @slang25 - the changes from this pull request have been published as part of version 8.6.0 📦, which is now available from NuGet.org 🚀