Revert “Reland “Scribble mixin”” by @XilaiZhang in https://github.com/flutter/flutter/pull/115146

Revert “Load assets in flutter_test without turning event loop.” by @dnfield in https://github.com/flutter/flutter/pull/115156

Make FutureBuilder handle SynchronousFuture correctly, reland SynchronousFuture usage in test assets by @dnfield in https://github.com/flutter/flutter/pull/115173

M3 Segmented Button widget by @darrenaustin in https://github.com/flutter/flutter/pull/113723

Fixed the color curve issue by @QuncCccccc in https://github.com/flutter/flutter/pull/115188