refactor to adapters

testing/factories/racing/DriverRefFactory.ts

@@ -0,0 +1,7 @@
+import type { ParticipantRef } from '@gridpilot/racing/domain/types/ParticipantRef';
+import type { ChampionshipType } from '@gridpilot/racing/domain/types/ChampionshipType';
+
+export const makeDriverRef = (id: string): ParticipantRef => ({
+  type: 'driver' as ChampionshipType,
+  id,
+});