[TimePicker] Design review - Refine onClose and onAccept behavior

[noraleonte]

Extracted from #8964 point 3

Right now, pressing ok or closing the picker both call onAccept and persist the value. At a first glance, there isn’t an easy way to override this behavior and cancel the value selection on closing the picker for instance.

I think we need an easier way to control what happens on closing the pickers. Something like:

• if there is an ok button, closing the picker resets the value.
• users should be able to easily override this behavior with onClose and onAccept lifecycle methods for instance
• if there is no ok button, the behavior should be the same as it is now.

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