44410 Add macOS fn key support. (cla: yes, framework, team)

44413 Turn off docs upload temporarily (cla: yes, team)

44421 switch web test to macOS (cla: yes, team)

44422 Remove TextRange, export it from dart:ui (cla: yes, framework)

44447 implicit-casts:false on flutter_tools/lib (cla: yes, tool)

44451 Use raw string for l10n description  (a: internationalization, cla: yes, team, waiting for tree to go green)

44454 Re-enable docs uploading (cla: yes, team)

44457 [flutter_tool] Update Fuchsia SDK (cla: yes, tool)