Fixes #86590

This changes the default build architectures for Flutter macOS apps to
x86_64 and arm64. Previously, we manually excluded arm64 builds via the
EXCLUDE_ARCHS Xcode setting in Flutter's generated xcconfig file. This
eliminates setting EXCLUDE_ARCHS during the build and updates the
default architectures in the tool and in the macos_assemble.sh wrapper.

Issue: https://github.com/flutter/flutter/issues/97681
Umbrella issue: https://github.com/flutter/flutter/issues/60113

When desktop support is not present in an existing project, certain
flutter tool commands raise an error that direct the user to
documentation on how to add desktop support to an existing Flutter
project. In a recent revamp of the webside, the URL was very slightly
changed (flutter.dev -> docs.flutter.dev).

This updates the error message to output the new URL.

Issue: https://github.com/flutter/flutter/issues/94398

This reverts commit 5fd259be.

This reverts commit 84e57678.

Re-land:  Allow users to pass in Xcode build settings as env variables to flutter build macos FLUTTER_XCODE_  (#82298)

Revert "Allow users to pass in Xcode build settings as env variables to flutter build macos FLUTTER_XCODE_ (#81384)" (#82004)

This reverts commit 0bba935b.

Allow users to pass in Xcode build settings as env variables to flutter build macos FLUTTER_XCODE_ (#81384)

This reverts commit 8b6baae4.

Our current top crasher is an unclear error when ProcessManager fails to resolve an executable path. To fix this, we'd like to being adjusting the process resolution logic and adding more instrumentation to track failures. In order to begin the process, the ProcessManager has been folded back into the flutter tool

= gets escaped into %3D which seems to be tripping up cmake on windows since % is a control character. Switch to base64 encoding, since this does not have % nor , in the output character set.

This change is not trivially cherry pickable, and isn't tested on windows aside from my local, manual tests due to the planned CI work not being complete yet.

Fixes #75017
Fixes #74705

* opt out the flutter tool

* oops EOF

* fix import

* Update tool_backend.dart

* Update daemon_client.dart

* fix more

* Add text to --analyze-size command output to launch DevTools with size data.

Fixes #61772

tool exit if there is no file at the path provided when building/running with sksl

Almost all of the flag setup on Linux, macOS, and Windows should be
identical; this pulls that common setup to a shared method.

This adds support for several flags on macOS that have all the necessary
plumbing already in place due to shared backend code, but were never
enabled.

Fixes https://github.com/flutter/flutter/issues/64944

* [flutter_tools] add analytics to code size, add more testing

* add gradle case

* Update build_macos_test.dart

* move analytics to code size tooling

* Update analyze_size.dart

* fix analysis