chore(turnier-feature): remove unused ViewModels and UI components

- Removed `AbteilungViewModel`, `BewerbAnlegenViewModel`, `BewerbViewModel`, and `CreateBewerbWizardScreen`.
- Cleaned up related imports and unused domain models.

frontend/features/veranstalter-feature/src/commonMain/kotlin/at/mocode/frontend/features/veranstalter/data/remote/FakeVeranstalterRepository.kt

@@ -38,7 +38,7 @@ class FakeVeranstalterRepository : VeranstalterRepository {
   }
 
   override suspend fun delete(id: Long): Result<Unit> {
-    mockData.removeIf { it.id == id }
+    mockData.removeAll { it.id == id }
     return Result.success(Unit)
   }
 }