Fix generator methods in _DenseAdaBoostClassifier to use yield from instead of return

[msamsami]

This PR fixes a bug in the _DenseAdaBoostClassifier where generator methods were incorrectly using return instead of yield from when delegating to the parent class.

Problem:

The staged methods (staged_score, staged_predict, staged_decision_function, staged_predict_proba) were using return super().method() which returns a generator object instead of yielding the values from the generator.

Solution:

Changed return to yield from for all generator methods to properly delegate to the parent generator and yield values iteratively.

Methods Fixed:

• staged_score
• staged_predict
• staged_decision_function
• staged_predict_proba

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This ensures the staged methods work correctly as generators and maintain API compatibility with scikit-learn's AdaBoostClassifier.