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/ScriptExecutorTests/ScriptExecutorTests.cs

@@ -2,7 +2,6 @@
 using System.IO;
 using System.Collections.Generic;
 using Microsoft.DotNet.Cli.Utils;
-using Microsoft.DotNet.ProjectModel;
 using Microsoft.DotNet.Tools.Test.Utilities;
 using System.Runtime.InteropServices;
 using Xunit;