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/languages/src/json.rs

@@ -98,19 +98,19 @@ impl JsonLspAdapter {
                     },
                     {
                         "fileMatch": [
-                            schema_file_match(&paths::SETTINGS),
-                            &*paths::LOCAL_SETTINGS_RELATIVE_PATH,
+                            schema_file_match(paths::settings_file()),
+                            paths::local_settings_file_relative_path()
                         ],
                         "schema": settings_schema,
                     },
                     {
-                        "fileMatch": [schema_file_match(&paths::KEYMAP)],
+                        "fileMatch": [schema_file_match(paths::keymap_file())],
                         "schema": KeymapFile::generate_json_schema(&action_names),
                     },
                     {
                         "fileMatch": [
-                            schema_file_match(&paths::TASKS),
-                            &*paths::LOCAL_TASKS_RELATIVE_PATH,
+                            schema_file_match(paths::tasks_file()),
+                            paths::local_tasks_file_relative_path()
                         ],
                         "schema": tasks_schema,
                     }