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/client/src/client.rs

@@ -509,7 +509,7 @@ impl Client {
         let credentials_provider: Arc<dyn CredentialsProvider + Send + Sync + 'static> =
             if use_zed_development_auth {
                 Arc::new(DevelopmentCredentialsProvider {
-                    path: paths::CONFIG_DIR.join("development_auth"),
+                    path: paths::config_dir().join("development_auth"),
                 })
             } else {
                 Arc::new(KeychainCredentialsProvider)

crates/client/src/telemetry.rs

@@ -223,7 +223,7 @@ impl Telemetry {
                 let state = state.clone();
                 async move {
                     if let Some(tempfile) =
-                        NamedTempFile::new_in(paths::CONFIG_DIR.as_path()).log_err()
+                        NamedTempFile::new_in(paths::config_dir().as_path()).log_err()
                     {
                         state.lock().log_file = Some(tempfile);
                     }