Migrating all test projects (#4668)

* WIP migrate tests

* WIP fixing more tests

* WIP fix test build break

* Test results files are now trx

* Get CI to pass until we get an xunit xml logger

* Added DotNetTestPJ since that was needed for one test

* Fix build break

* Forgot to add DotNetTestPJ as a build task

* Need to restore project.json for the project used in ubuntu test

* Restore PJ for ubuntu test

* Switch the Ubuntu test to csproj based

test/Microsoft.DotNet.Tools.Tests.Utilities/Commands/CleanCommand.cs

@@ -4,7 +4,6 @@
 using System;
 using Microsoft.DotNet.Cli.Utils;
 using System.Runtime.InteropServices;
-using Microsoft.DotNet.ProjectModel;
 
 namespace Microsoft.DotNet.Tools.Test.Utilities
 {