toggleableActiveColor
ThemeData
This PR is to remove deprecated ThemeData.toggleableActiveColor. These parameters are made obsolete in https://github.com/flutter/flutter/pull/97972. Part of https://github.com/flutter/flutter/pull/111080
Fixes https://github.com/flutter/flutter/issues/143482 This brings in the gallery more or less as is: * Removed localizations * Ensure tests still run (locally verified, will switch CI later). * Removed deferred components * Fixup pubspec