Enable the unit tests in faceteddate addon again

Although I dislike the faceteddate project addon a lot, and also the changes that were done for it in the ServicingNodeIndexer, I need these unit tests to run again: Namely, I want to move the ill-placed child node iteration from the ServicingNodeIndexer to the ServicingSearchIndex node aggregation, but I need some validation that I do it correct: This is because some customer code depends on the indexing of child properties. I'd rather deprecate it all together, but I think too much custom code relies on it,

Hence, I'll keep the functionality intact, but move the indexing of child node props to a less harmful place