Bug - failed to detect related test cases

[Aaronontheweb]

akkadotnet/akka.net#3883 - failed to detect related test cases on this PR.

Output from the incrementalist process on this build:

D:\a\1\s\src\core\Akka.Persistence\Akka.Persistence.csproj
D:\a\1\s\src\core\Akka.Remote.TestKit\Akka.Remote.TestKit.csproj
D:\a\1\s\src\core\Akka.Remote\Akka.Remote.csproj
D:\a\1\s\src\core\Akka.Streams\Akka.Streams.csproj

[Aaronontheweb]

I figured out this issue - it's due to the following:

Because we are multi-targeting with .NET Core and .NET Framework, only one of the projectIds with that file path gets selected in the current implementation of the code. For whatever reason, that causes problems with Roslyn's lookup for projects and dependencies. Might need to try resolving all of the matching projects given an affected project file.