28036 Revert ‘[fuchsia] Make dart_runner work with cfv2 (#27226)’ (cla: yes, platform-fuchsia, needs tests)

28037 Roll Dart SDK from 624de6ea9e59 to 8e3be460559f (1 revision) (cla: yes, waiting for tree to go green)

28038 Update builder configurations to apply the new generators format. (cla: yes)

28039 Roll Fuchsia Mac SDK from Gou0gs-Pc… to j0tWnUn2K… (cla: yes, waiting for tree to go green)

28040 Add bundletool to DEPS and remove outdated header comment (cla: yes)