Fix local Y vs global Y_Train in generate_batch function in TURBO tutorial (#2862)

Summary:
Also add type hints and most linting issues according to ruff settings

Pull Request resolved: #2862

Reviewed By: saitcakmak, esantorella

Differential Revision: D75449398

Pulled By: Balandat

fbshipit-source-id: 26ef07fde02d2ae0d0651fbc30619c005e7ed075

Author: CompRhys