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 

# User-Facing Changes
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Cargo.toml

@@ -93,7 +93,6 @@ nix = { version = "0.26", default-features = false, features = [
 	"fs",
 	"term",
 ] }
-is-terminal = "0.4.8"
 
 [dev-dependencies]
 nu-test-support = { path = "./crates/nu-test-support", version = "0.84.1" }

crates/nu-cli/Cargo.toml

@@ -32,7 +32,6 @@ crossterm = "0.26"
 fancy-regex = "0.11"
 fuzzy-matcher = "0.3"
 is_executable = "1.0"
-is-terminal = "0.4.8"
 log = "0.4"
 miette = { version = "5.10", features = ["fancy-no-backtrace"] }
 once_cell = "1.18"

crates/nu-cli/src/repl.rs

@@ -6,7 +6,6 @@ use crate::{
     NuHighlighter, NuValidator, NushellPrompt,
 };
 use crossterm::cursor::SetCursorStyle;
-use is_terminal::IsTerminal;
 use log::{trace, warn};
 use miette::{ErrReport, IntoDiagnostic, Result};
 use nu_cmd_base::util::get_guaranteed_cwd;
@@ -26,7 +25,7 @@ use reedline::{
     SqliteBackedHistory, Vi,
 };
 use std::{
-    io::{self, Write},
+    io::{self, IsTerminal, Write},
     path::Path,
     sync::atomic::Ordering,
     time::Instant,

crates/nu-command/Cargo.toml

@@ -49,7 +49,6 @@ fs_extra = "1.3"
 htmlescape = "0.3"
 indexmap = "2.0"
 indicatif = "0.17"
-is-terminal = "0.4.8"
 itertools = "0.10"
 log = "0.4"
 lscolors = { version = "0.15", default-features = false, features = ["nu-ansi-term"] }

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};

crates/nu-system/Cargo.toml

@@ -18,7 +18,6 @@ log = "0.4"
 
 [target.'cfg(target_family = "unix")'.dependencies]
 nix = { version = "0.26", default-features = false, features = ["fs", "term", "process", "signal"] }
-is-terminal = "0.4.8"
 
 [target.'cfg(any(target_os = "linux", target_os = "android"))'.dependencies]
 procfs = "0.15"

crates/nu-system/src/foreground.rs

@@ -83,11 +83,11 @@ impl Drop for ForegroundChild {
 // It's a simpler version of fish shell's external process handling.
 #[cfg(unix)]
 mod fg_process_setup {
-    use is_terminal::IsTerminal;
     use nix::{
         sys::signal,
         unistd::{self, Pid},
     };
+    use std::io::IsTerminal;
     use std::os::unix::prelude::{CommandExt, RawFd};
 
     // TODO: when raising MSRV past 1.63.0, switch to OwnedFd

src/terminal.rs

@@ -1,11 +1,11 @@
 #[cfg(unix)]
 pub(crate) fn acquire_terminal(interactive: bool) {
-    use is_terminal::IsTerminal;
     use nix::{
         errno::Errno,
         sys::signal::{signal, SigHandler, Signal},
         unistd,
     };
+    use std::io::IsTerminal;
 
     if interactive && std::io::stdin().is_terminal() {
         // see also: https://www.gnu.org/software/libc/manual/html_node/Initializing-the-Shell.html