Dialog should detect action from ancestor of event target

[kfranqueiro]

The logic landing from #3413 currently only detects actions based on event.target directly.

This means that if you have any child elements within an element that represents an action (e.g. an icon inside of a list item), interacting with that child element will not properly reflect that the action was performed.

The dialog code should use mdc-dom/ponyfill.closest (#3559) to identify an action associated with interaction events.