new dotnet test experience silently does not work when using current template

[nohwnd]

Describe the bug

Mixed mode prevention will skip the run because of bug in IsTestingPlatformApplication #4307 , and it will report zero tests run, even on project that is generated from latest templated with mstest runner.

The failure has no indication of what happened. And can only be seen in diag logs.

Steps To Reproduce

dotnet new mstest --test-runner mstest
dotnet test

Expected behavior

Tests run, or they fail with error that is specific and visible.