Use built-in is_terminal instead of is_terminal::is_terminal (#9550)

# Description
This PR tries to remove ~atty~ is-terminal from the entire code base,
since ~[atty is
unmaintained](https://rustsec.org/advisories/RUSTSEC-2021-0145) and~
[`is_terminal` has been
stabilized](https://blog.rust-lang.org/2023/06/01/Rust-1.70.0.html#isterminal)
in rust 1.70.0.

cc @fdncred 

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crates/nu-command/src/viewers/table.rs

@@ -1,4 +1,3 @@
-use is_terminal::IsTerminal;
 use lscolors::{LsColors, Style};
 use nu_color_config::color_from_hex;
 use nu_color_config::{StyleComputer, TextStyle};
@@ -15,6 +14,7 @@ use nu_table::{
     TableOutput,
 };
 use nu_utils::get_ls_colors;
+use std::io::IsTerminal;
 use std::sync::Arc;
 use std::time::Instant;
 use std::{path::PathBuf, sync::atomic::AtomicBool};