exclude flutter_app from main analysis

fix

Author: goderbauer

analysis_options.yaml

@@ -0,0 +1,3 @@
+analyzer:
+  exclude:
+    - pkgs/objective_c/example/flutter_app # Flutter app that does not analyze as part of `dart analyze` for the workspace.

tool/ci.dart

@@ -2,8 +2,8 @@
 // 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 'dart:io';
 import 'dart:ffi';
+import 'dart:io';
 
 import 'package:args/args.dart';
 import 'package:yaml/yaml.dart';