Incorporate human exclusion into inatVisionAPI

[pleary]

Currently the node API is responsible for modifying results to be empty, or to exclusively return just the Human taxon based on the result scores. These calculations can be ported to inatVisionAPI so consolidate our model/result interaction code into a single codebase.

The goal of this ticket is to have the inatVisionAPI determine if, based on the results and score, we should recommend only Human, or recommend no results at all. We may want to indicate this with some sort of flag in the results instead of just removing results, in case we would like to access the excluded results for various downstream evaluation later on.

[pleary]

This was added in https://github.com/inaturalist/inatVisionAPI/commit/7d603da71f7a10735e1b84ac37fd33fe81ea35cf

• We will never recommend a common ancestor of taxon Homo
• If there are multiple results and human is one of them,
  • If human is first and its score is more than 1.5 times the next score, return only humans
  • Otherwise return no results at all