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/database/commands/into_sqlite.rs

@@ -359,7 +359,6 @@ fn nu_value_to_sqlite_type(val: &Value) -> Result<&'static str, ShellError> {
         | Type::Custom(_)
         | Type::Error
         | Type::List(_)
-        | Type::ListStream
         | Type::Range
         | Type::Record(_)
         | Type::Signature