add missing benchmark test file fromhttps://github.com/flutter/flutter/pull/102532 (#102544)

dev/benchmarks/macrobenchmarks/test/animated_complex_opacity_perf_e2e.dart

+// Copyright 2014 The Flutter Authors. 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:macrobenchmarks/common.dart';
+
+import 'util.dart';
+
+void main() {
+  macroPerfTestE2E(
+    'animated_complex_opacity_perf',
+    kAnimatedComplexOpacityPerfRouteName,
+    pageDelay: const Duration(seconds: 1),
+    duration: const Duration(seconds: 5),
+  );
+}