Function drain

pub fn drain<'a, T: Config<I>, I: 'static>(
    balance: &'a mut VirtualBalance<T, I>,
    variant: &'a T::Position,
    id: &'a Digest<T>,
) -> Result<(), DispatchError>

Drains all value associated with a (variant, digest) pair via LazyBalance::drain execution.

Wraps plugin dispatch using LazyInput::Drain and performs full state cleanup.