[flutter_tools] implement build aot in terms of assemble for iOS

[jonahwilliams]

Description

Refactors the iOS profile/release script to delegate to assemble. This allows us to incrementally move xcode_backend.sh from bash to dart.

#32925

[fluttergithubbot]

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[jonahwilliams]

tested via existing iOS devicelab tests and previously written unit tests for targets/ios.dart

[jmagman]

This caused some errant status output for build ios-framework.

Building App.framework for arm64...                                     
Building App.framework for armv7...          

Before:

Building framework for com.m.flutterapp in debug mode...
 ├─Populating Flutter.framework...                                  0.1s
 ├─Creating Flutter.xcframework...                               1,075ms
 ├─Adding placeholder App.framework for debug...                   150ms
 ├─Assembling Flutter resources for App.framework...                6.1s
 ├─Creating App.xcframework...                                     619ms
Running pod install...                                              1.1s
 ├─Building plugins...                                              5.8s
 └─Moving to ../../MyApp/Flutter/Debug                              0.0s
Building framework for com.m.flutterapp in profile mode...
 ├─Populating Flutter.framework...                                  0.1s
 ├─Creating Flutter.xcframework...                                 538ms
 ├─Building Dart AOT for App.framework...                          18.6s
 ├─Assembling Flutter resources for App.framework...                0.1s
 ├─Creating App.xcframework...                                     547ms
 ├─Building plugins...                                              3.9s
 └─Moving to ../../MyApp/Flutter/Profile                            0.0s
Building framework for com.m.flutterapp in release mode...
 ├─Populating Flutter.framework...                                  0.8s
 ├─Creating Flutter.xcframework...                               1,167ms
 ├─Building Dart AOT for App.framework...                          80.9s
 ├─Assembling Flutter resources for App.framework...                0.1s
 ├─Creating App.xcframework...                                     575ms
 ├─Building plugins...                                              4.0s
 └─Moving to ../../MyApp/Flutter/Release                            0.0s

After:

Building frameworks for com.m.flutterapp in debug mode...
 ├─Populating Flutter.framework...                                  0.1s
 ├─Creating Flutter.xcframework...                                  1.0s
 ├─Adding placeholder App.framework for debug...                   144ms
 ├─Assembling Flutter resources for App.framework...                6.0s
 ├─Creating App.xcframework...                                      0.6s
Running pod install...                                              1.1s
 ├─Building plugins...                                              8.8s
 └─Moving to ../../MyApp/Flutter/Debug                              0.0s
Building frameworks for com.m.flutterapp in profile mode...
 ├─Populating Flutter.framework...                                  0.2s
 ├─Creating Flutter.xcframework...                                  0.6s
Building App.framework for arm64...                                     
Building App.framework for armv7...                                     
 ├─Building Dart AOT for App.framework...                          20.3s
 ├─Assembling Flutter resources for App.framework...                0.1s
 ├─Creating App.xcframework...                                      0.6s
 ├─Building plugins...                                              5.6s
 └─Moving to ../../MyApp/Flutter/Profile                            0.0s
Building frameworks for com.m.flutterapp in release mode...
 ├─Populating Flutter.framework...                                  0.9s
 ├─Creating Flutter.xcframework...                                  1.3s
Building App.framework for arm64...                                     
Building App.framework for armv7...                                     
 ├─Building Dart AOT for App.framework...                          83.0s
 ├─Assembling Flutter resources for App.framework...                0.1s
 ├─Creating App.xcframework...                                      0.9s
 ├─Building plugins...                                              6.0s
 └─Moving to ../../MyApp/Flutter/Release                            0.0s

It's passing in quiet = true

  await aotBuilder.build(
    platform: TargetPlatform.ios,
    outputPath: iPhoneBuildOutput.path,
    buildMode: mode,
    // Relative paths show noise in the compiler https://github.com/dart-lang/sdk/issues/37978.
    mainDartFile: globals.fs.path.absolute(targetFile),
    quiet: true,
    bitcode: true,
    reportTimings: false,
    iosBuildArchs: <DarwinArch>[DarwinArch.armv7, DarwinArch.arm64],
    dartDefines: dartDefines,
  );

[jonahwilliams]

Good catch, will take a look and fix it.

[jonahwilliams]

The snapshotter calls now correctly pass quiet.

[jmagman]

LGTM