[nushell] Generates invalid completions when variadic arg is used with last=true arg

Please complete the following tasks

[X] I have searched the discussions
[X] I have searched the open and rejected issues

Rust Version

rustc 1.81.0 (eeb90cda1 2024-09-04)

Clap Version

4.5.19

Minimal reproducible code

use clap::Args;
use clap_complete::generate;
use clap_complete_nushell::Nushell;

#[derive(Args)]
pub struct ExampleArgs {
    #[arg(required = true, help = "...")]
    pub id: Vec<String>,

    // after --
    #[arg(last = true, help = "...")]
    pub passthrough: Vec<String>,
}

#[derive(Subcommand)]
pub enum CliCommand {
  #[command(name = "example")
  Example(ExampleArgs),
}

#[derive(Parser)]
pub struct Cli {
  #[command(subcommand)]
  pub command: CliCommand,
}

fn main() {
  let mut app = Cli::command();
  let mut stdio = std::io::stdout();
  generate(Nushell, &mut app, "bin", &mut stdio);
}

Steps to reproduce the bug with the above code

cargo run -- example

Actual Behaviour

It generates a completion that uses ...<arg>: string syntax for both the variadic arg, and the last arg. This results in Nu erroring with "Multiple rest params".

Example: https://cdn.discordapp.com/attachments/974160221452763149/1289506849053343845/image.png?ex=6706ea16&is=67059896&hm=6df6cb538be11ccf5a531f46c2dab73013e965749fe809a95287666b16188803&

Expected Behaviour

This generates a valid completion. We probably want to omit last args entirely.

Additional Context

No response

Debug Output