81384 Allow users to pass in Xcode build settings as env variables to flutter build macos FLUTTER_XCODE_ (tool, cla: yes, waiting for tree to go green)

81401 [flutter_tools] remove mocks and globals from macOS tests (tool, cla: yes, waiting for tree to go green)

81403 [versions] roll versions and add ffi dep (team, tool, cla: yes)

81417 Integrate package:flutter_lints into templates (tool, cla: yes, waiting for tree to go green)

81423 [flutter_tools] remove mocks, globals from golden comparator and test runner tests (tool, cla: yes, waiting for tree to go green)

81433 [flutter_tools] remove mocks from simcontrol and context (tool, cla: yes, waiting for tree to go green)