Adds missing `/repositories` and `/services` tests

[matuella]

There are a significant amount of repositories/services implementations that weren't tested.

The list below is a summary of all untested classes:

Repositories

• [ ] CollectionRepositoryImpl;
• [ ] MemoExecutionRepositoryImpl;
• [ ] MemoRepositoryImpl;
• [ ] ResourceRepositoryImpl;
• [ ] UserRepositoryImpl;
• [ ] VersionRepositoryImpl.

Services

• [ ] MemoryRecallServicesImpl;
• [ ] CollectionServicesImpl;
• [ ] ExecutionServicesImpl;
• [ ] ProgressServicesImpl;
• [ ] ResourceServicesImpl;
• [ ] UserServicesImpl;
• [ ] VersionServicesImpl.