Correct a few import sortings (#130435)

Move a few import directives to be in correct order. Fixes https://github.com/flutter/flutter/issues/130434

dev/benchmarks/microbenchmarks/lib/gestures/gesture_detector_bench.dart

@@ -4,8 +4,8 @@
 
 import 'package:flutter_test/flutter_test.dart';
 
-import './apps/button_matrix_app.dart' as button_matrix;
 import '../common.dart';
+import 'apps/button_matrix_app.dart' as button_matrix;
 
 const int _kNumWarmUpIters = 20;
 const int _kNumIters = 300;

dev/conductor/core/test/packages_autoroller_test.dart

@@ -11,8 +11,8 @@ import 'package:conductor_core/packages_autoroller.dart';
 import 'package:file/memory.dart';
 import 'package:platform/platform.dart';
 
-import './common.dart';
 import '../bin/packages_autoroller.dart' show run;
+import 'common.dart';
 
 void main() {
   const String flutterRoot = '/flutter';