Remove IErrorReporter from test infrastructure

Author: DustinCampbell

src/Razor/test/Microsoft.AspNetCore.Razor.Test.Common.Tooling/ToolingTestBase.TestErrorReporter.cs

@@ -46,7 +46,6 @@ static ToolingTestBase()
     private readonly CancellationTokenSource _disposalTokenSource;
     private List<IDisposable>? _disposables;
     private List<IAsyncDisposable>? _asyncDisposables;
-    private IErrorReporter? _errorReporter;
     private ProjectSnapshotManagerDispatcher? _dispatcher;
 
     /// <summary>
@@ -80,8 +79,6 @@ static ToolingTestBase()
     /// </summary>
     private protected ILogger Logger => _logger ??= LoggerFactory.GetOrCreateLogger(GetType().Name);
 
-    private protected IErrorReporter ErrorReporter => _errorReporter ??= new TestErrorReporter(Logger);
-
     private protected ProjectSnapshotManagerDispatcher Dispatcher => _dispatcher ??= CreateDispatcher();
 
     protected ToolingTestBase(ITestOutputHelper testOutput)