16689 Add more child lifecycle tests (cla: yes)

16690 fuchsia: remove use of replace_as_executable (cla: yes)

16691 Roll src/third_party/skia c5ff41f2976e..7dfb46e7f397 (20 commits) (cla: yes, waiting for tree to go green)

16692 Roll fuchsia/sdk/core/mac-amd64 from _jvYk… to WZgbp… (cla: yes, waiting for tree to go green)

16693 Roll src/third_party/dart 0f141be8bd52..7469b87b042a (9 commits) (cla: yes, waiting for tree to go green)

16694 Fix FlutterPlugin doc param reference (cla: yes, waiting for tree to go green)