Remove ListStream type (#14425)

# Description
List values and list streams have the same type (`list<>`). Rather,
streaming is a separate property of the pipeline/command output. This PR
removes the unnecessary `ListStream` type.

# User-Facing Changes
Should be none, except `random dice` now has a more specific output
type.

crates/nu-command/src/system/nu_check.rs

@@ -15,7 +15,6 @@ impl Command for NuCheck {
         Signature::build("nu-check")
             .input_output_types(vec![
                 (Type::String, Type::Bool),
-                (Type::ListStream, Type::Bool),
                 (Type::List(Box::new(Type::Any)), Type::Bool),
             ])
             // type is string to avoid automatically canonicalizing the path