Remove itertools dependency

Summary:
`itertools` was only used in `src/test_lib.rs` for `.sorted()` in two spots, both of which immediately collected into a `Vec`. Replaced them with a plain `Vec::sort`, which removes the only usage of the crate and lets us drop it as a dependency of `lifeguard_lib`.

Removed `itertools` from `src/BUCK`, regenerated `src/Cargo.toml` via `arc autocargo`, and dropped the now-unused reference from `Cargo.lock` (the `itertools 0.14.0` package entry stays since other crates still depend on it).

Reviewed By: QuantumManiac

Differential Revision: D107157742

fbshipit-source-id: 52ea7f9aab98e372f7a43a197e325526b0e93e7c

Author: brittanyrey

Cargo.lock

@@ -20,7 +20,6 @@ ahash = { version = "0.8.11", features = ["serde"] }
 anyhow = "1.0.102"
 clap = { version = "4.6.0", features = ["derive", "env", "string", "unicode", "wrap_help"] }
 dashmap = { version = "6.1.0", features = ["rayon", "serde"] }
-itertools = "0.14.0"
 libc = "0.2.186"
 lifeguard_stubs = { path = "../resources" }
 petgraph = { version = "0.8", features = ["serde-1"] }

src/Cargo.toml

@@ -12,7 +12,6 @@ use std::process::Command;
 
 use ahash::AHashMap;
 use ahash::AHashSet;
-use itertools::Itertools;
 use pyrefly_python::module::Module;
 use pyrefly_python::module_name::ModuleName;
 use rayon::prelude::*;
@@ -396,15 +395,9 @@ pub fn check_imports(
         .pending_imports
         .iter()
         .map(|(k, v)| {
-            (
-                k.clone(),
-                v.iter()
-                    .cloned()
-                    .collect::<Vec<_>>()
-                    .into_iter()
-                    .sorted()
-                    .collect::<Vec<_>>(),
-            )
+            let mut imports = v.iter().cloned().collect::<Vec<_>>();
+            imports.sort();
+            (k.clone(), imports)
         })
         .collect();
     expected_pending_imports.sort_by_key(|a| a.0);
@@ -413,15 +406,9 @@ pub fn check_imports(
         .called_imports
         .iter()
         .map(|(k, v)| {
-            (
-                k.clone(),
-                v.iter()
-                    .cloned()
-                    .collect::<Vec<_>>()
-                    .into_iter()
-                    .sorted()
-                    .collect::<Vec<_>>(),
-            )
+            let mut imports = v.iter().cloned().collect::<Vec<_>>();
+            imports.sort();
+            (k.clone(), imports)
         })
         .collect();
     expected_called_imports.sort_by_key(|a| a.0);