switch to using xUnit output helper

Author: TylerLeonhardt

test/PowerShellEditorServices.Test.E2E/TestsFixture.cs

@@ -83,11 +83,6 @@ public async Task InitializeAsync()
             DirectoryInfo testdir =
                 Directory.CreateDirectory(Path.Combine(s_binDir, Path.GetRandomFileName()));
 
-            LanguageClient.Window.OnLogMessage((message, messageType) =>
-            {
-                Console.WriteLine($"{messageType.ToString()}: {message}");
-            });
-
             await LanguageClient.Initialize(testdir.FullName);
 
             // Make sure Script Analysis is enabled because we'll need it in the tests.