fix: replace first and last name with single field (#4915)

mobile/test/sync_service_test.dart

@@ -62,8 +62,7 @@ void main() {
       id: "1",
       updatedAt: DateTime.now(),
       email: "a@b.c",
-      firstName: "first",
-      lastName: "last",
+      name: "first last",
       isAdmin: false,
     );
     setUpAll(() async {