Update node API to use inatVisionAPI-derived common ancestor and results directly

[pleary]

Strip down the functionality of the node API to fetch the common ancestor from the python API, then just fetch taxon metadata and return. Remove taxon mapping steps, common ancestor calculation, human exclusion, or anything else that modifies results from inatVisionAPI

[pleary]

This is all set and can be enabled with a config value. Staging is already using it. When we're ready we can update the production config and it will start using it as well