Drop deprecated features

[Jupi007]

There's a lot of properties annotated as @Deprecated, we should drop them in the next major release.

Like this:

https://github.com/ubuntu/yaru.dart/blob/6a88731b72870b4ddca28754b6116bf20c06455d/lib/src/widgets/yaru_linear_progress_indicator.dart#L25-L26

I'll add todo comments to remind us this.