Inspector v2: Scene explorer expand tree for selected item and scroll to it if needed

[ryantrem]

• When an entity is selected (for example from the property pane), the scene explorer tree is now expanded to include that item.
• If the entity was externally selected (not from within scene explorer itself), we scroll to that item to make sure it is visible.
• Also added the parent link property for Node to further test these changes.

[bjsplat]

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