19972 Remove android view from the Mutator stack (cla: yes, platform-android)

19986 1.20.0 CP: Remove android view from the Mutator stack (#19972) (cla: yes, platform-android)

20092 Manual roll of Dart from 24c7666def…40fd1c456e (cla: yes, platform-android, platform-ios)

20100 Wait before switching surfaces (cla: yes, platform-android, waiting for tree to go green)

20139 Add ALERT SoundType enum value (cla: yes, platform-android)

20144 Add TextInput sendAppPrivateCommand to Flutter Engine (cla: yes, platform-android)

20180 1.20 CP: Wait before switching surfaces (#20100) (cla: yes, platform-android)