Need to get the path to the `dotnet.exe` host in GetRunInformation MSBuild target

We are currently returning `dotnet.exe` without a path in `<Target Name="GenerateRunInformation">` in the Microsoft.DotNet.Core.Sdk.targets file.

We should either:
1. Figure out a way to get to the correct `dotnet.exe` to call from inside our MSBuild target.
2. Or pass back some sort of indicator to `dotnet run` that this project should use its host to run the project.
