When a new liboverride is created from the IDTemplate UI widget, in case
its hierarchy root is different than the liboverride itself, ensure that
it is also instanciated in the scene, if possible (i.e. if it's an
object or collection).
Should allow for better representation of liboverride hierarchies
created that way, and reduce the risk of getting key liboverrides hidden
from the scene's hierarchy (in the Outliner ViewLayer view e.g.).
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