Update the statuses of various analysis server integration tests.

pkg/analysis_server/test/integration/analysis/error_driver_test.dart

 // Copyright (c) 2014, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 import 'package:test_reflective_loader/test_reflective_loader.dart';
 
 import 'error_test.dart';
 
 main() {
   defineReflectiveSuite(() {
     defineReflectiveTests(AnalysisErrorIntegrationTest_Driver);
   });
 }
 
 @reflectiveTest
 class AnalysisErrorIntegrationTest_Driver
     extends AbstractAnalysisErrorIntegrationTest {
   @override
   bool get enableNewAnalysisDriver => true;
 
   @failingTest
   test_super_mixins_enabled() async {
+    // We see errors here with the new driver (#28870).
     //  Expected: empty
     //    Actual: [
     //    AnalysisError:{"severity":"ERROR","type":"COMPILE_TIME_ERROR","location":{"file":"/var/folders/00/0w95r000h01000cxqpysvccm003j4q/T/analysisServerfbuOQb/test.dart","offset":31,"length":1,"startLine":1,"startColumn":32},"message":"The class 'C' can't be used as a mixin because it extends a class other than Object.","correction":"","code":"mixin_inherits_from_not_object","hasFix":false},
     //    AnalysisError:{"severity":"ERROR","type":"COMPILE_TIME_ERROR","location":{"file":"/var/folders/00/0w95r000h01000cxqpysvccm003j4q/T/analysisServerfbuOQb/test.dart","offset":31,"length":1,"startLine":1,"startColumn":32},"message":"The class 'C' can't be used as a mixin because it references 'super'.","correction":"","code":"mixin_references_super","hasFix":false}
     //  ]
     return super.test_super_mixins_enabled();
   }
 }