[Feature] Log metrics to visualizer on test run

[InakiRaba91]

What is the feature?

I think the metrics computed during a test run to evaluate a model are not being logged to the visualizer, (i.e.: MLflow). They're passed to the logger hook here, but there's no call to the visualizer as in train/val.

I've submitted a tentative PR with the proposed change. Let me know if I'm missing something obvious and this is already covered. Thanks!