refactor: Improve game list scanning with std::filesystem

Refactors the game list scanning code to use std::filesystem instead of custom
directory iteration functions. Main changes include:

- Replace Common::FS directory iteration with std::filesystem iterators
- Split game file processing logic into separate ProcessGameFile method
- Improve error handling with try-catch for filesystem operations
- Simplify control NCA metadata extraction
- Use more modern C++ features and cleaner code organization

This change should improve maintainability and reliability of the game
scanning system while potentially offering better performance through
native filesystem APIs.

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