paths: Replace lazy_static! with OnceLock (#13213)

This PR replaces the `lazy_static!` usages in the `paths` crate with
`OnceLock` from the standard library.

This allows us to drop the `lazy_static` dependency from this crate.

The paths are now exposed as accessor functions that reference a private
static value.

Release Notes:

- N/A

crates/settings/src/settings_file.rs

@@ -92,7 +92,7 @@ pub fn handle_settings_file_changes(
 }
 
 async fn load_settings(fs: &Arc<dyn Fs>) -> Result<String> {
-    match fs.load(&paths::SETTINGS).await {
+    match fs.load(paths::settings_file()).await {
         result @ Ok(_) => result,
         Err(err) => {
             if let Some(e) = err.downcast_ref::<std::io::Error>() {
@@ -115,7 +115,7 @@ pub fn update_settings_file<T: Settings>(
         let new_text = cx.read_global(|store: &SettingsStore, _cx| {
             store.new_text_for_update::<T>(old_text, update)
         })?;
-        let initial_path = paths::SETTINGS.as_path();
+        let initial_path = paths::settings_file().as_path();
         if fs.is_file(initial_path).await {
             let resolved_path = fs.canonicalize(initial_path).await.with_context(|| {
                 format!("Failed to canonicalize settings path {:?}", initial_path)