Revert range expansion for to nuon (#8210)

# Description

The code to generate the nuon format supports writing range literals,
which obviates the need to expand the range as added in #8047

# User-Facing Changes

`to nuon` will still output ranges as literals

# Tests + Formatting

- Add test for `to nuon` range output
- Add `from nuon` test for range

crates/nu-command/src/formats/to/nuon.rs

@@ -34,7 +34,6 @@ impl Command for ToNuon {
         call: &Call,
         input: PipelineData,
     ) -> Result<PipelineData, ShellError> {
-        let input = input.try_expand_range()?;
         Ok(Value::String {
             val: to_nuon(call, input)?,
             span: call.head,