[Grouping] Remove setTimeout when duplicating elements

[w33ble]

Kibana version: 6.6+

Describe the bug:

Pulled from this comment on #25854.

When the rawDuplicateElement action is used, there's an element selection that happens in a setTimeout at the end. It's mostly a hacky workaround to wait for aeroelastic to update, and seems really prone to race conditions.

From @monfera:

I want to circle back to this one, the element in aeroelastic is not present yet if done synchronously, so it can't select (pasting will create a new group, naturally with a new id). So the purpose is to switch selection to the newly pasted thing, even if it's a group. I think it's due to the fact that cloning is done outside aero but selection is in good part, inside (eg. to activate the resize frame). I'm sometimes thinking about a different synchronization between aero and the Redux actions / thunks, it got fairly convoluted. Something I'm planning to touch on on our Jan 10 discussion on the layout engine.

[elasticmachine]

Pinging @elastic/kibana-canvas