Updates the AppIcon assets in the macOS app template to meet Apple's
icon guidelines as of macOS Big Sur. Assets were moved to the
[flutter_template_images][1] package, which includes them as of version
4.1.0.

Ref: https://developer.apple.com/design/human-interface-guidelines/macos/icons-and-images/app-icon/

Issue: https://github.com/flutter/flutter/issues/103371

[1]: https://github.com/flutter/packages/tree/main/packages/flutter_template_images

Roll dependendencies

This rolls depdendencies to latest using
flutter update-packages --force-upgrade

This change includes three code changes:

* Removes charcode from the dependencies allowlist since it no longer
  appears in the transitive closure of dependencies of the flutter,
  flutter_test, flutter_driver, flutter_localizations, and
  integration_test packages.

* Uses Resolver.create instead of the deprecated Resolver constructor.
  The default Resolver constructor has been deprecated in favour of the
  static Resolver.create() factory function, which unfortunately happens
  to be async. Propagated the async-ness up the chain.
  This change was partially reverted and the deprecation ignored in this
  patch until package:coverage can be rolled internally at Google.

* Eliminates the use of the deprecated packagesPath parameter to
  HitMap.parseJson. This parameter was deprecated and replaced with
  packagePath in https://github.com/dart-lang/coverage/pull/370 which
  was part of the overall deprecation of the .packages file in Dart
  itself https://github.com/dart-lang/sdk/issues/48272. The overall goal
  being that end-user code shouldn't need to know about implementation
  details such as whether dependency information is stored in a
  .packages file or a package_info.json file, but rather use the
  package_config package to obtain the package metadata and perform
  other functions such as resolving its dependencies to filesystem
  paths. packagesPath was replaced by packagePath, which takes the path
  to the package directory itself. Internally, package:coverage then
  uses package_config to do the rest of the package/script URI
  resolution to filesystem paths.
  This change was partially reverted and the deprecation ignored in this
  patch until package:coverage can be rolled internally at Google.

This is a pre-update prior to updating flutter_template_images in
https://github.com/flutter/flutter/pull/103739

Issue: https://github.com/flutter/flutter/issues/103371
Issue: https://github.com/flutter/flutter/issues/103775
Issue: https://github.com/flutter/flutter/issues/103830

When re-applying the partially-reverted changes to code coverage,
we'll need to patch host_entrypoint.dart internally to await the Future
that we'll be returning rather than a non-async value.

Many of our flutter_tools templates include image assets such as
application icons. Adding these will trigger an analysis error from our
CI tooling.

This adds a pointer to the wiki describing the procedure for adding or
updating image assets in the templates:
https://github.com/flutter/flutter/wiki/Managing-template-image-assets

Uncovered while working on https://github.com/flutter/flutter/issues/103371

Until recently, BuildInfo.packagesPath defaulted to `.packages` however,
the .packages file has been deprecated [1] and is being removed. In
https://github.com/flutter/flutter/pull/99677 the default was changed to
`.dart_tool/package_config.json` but the doc comment was accidentally
updated to `.dart_tool/packages`. This corrects it to the true default
value.

1: https://github.com/dart-lang/sdk/issues/48272

Spotted in the midst of some related cleanup relating to
https://github.com/flutter/flutter/issues/103775

a71d3867a Roll Dart SDK from c23ec46618c1 to e7590a9bb416 (1 revision) (flutter/engine#33342) (#103806)

Point users of boolArgDeprecated to boolArg rather than to
boolArgDeprecated in order to avoid losing users to infinite loops or
stack overflows depending on their implementation.

* c4b899f63 Roll dart sdk to 7b24ff4d92e2d2136020fc5bedadfe7025861510 (flutter/engine#33309)

* 7956603cc [web] Migrate Flutter Web DOM usage to JS static interop - 12. (flutter/engine#33241)

* 1d0c2ae6f Roll Skia from 1e43dce386c9 to f6e31bf1dcfb (6 revisions) (flutter/engine#33320)

* ed5a2fef0 Roll Skia from f6e31bf1dcfb to 69fecd6c2d85 (1 revision) (flutter/engine#33322)

* 10e0e1534 Revert "[web] Migrate Flutter Web DOM usage to JS static interop - 12. (#33241)" (flutter/engine#33321)

* fix local tests
Co-authored-by: Jonah Williams <jonahwilliams@google.com>

Adds macOS support to the layers examples collection.

Issue: https://github.com/flutter/flutter/issues/84306