Filter out obsoleted terms from search

[kshefchek]

Currently obsoleted terms make into our search index. Anchoring the category/categories can fix this, but it would be better to not index them in the first place - unless we foresee a use case where we want to search for obsoleted terms

[cmungall]

There is a use case to returning obsoletes in search. However, the API should clearly mark these as obsolete in the payload, which is not happening here. The UI should downweight these and clearly indicate with a visual metaphor that is consistent across interfaces (e.g. red, strikethrough, a warning this term is obsolete marker etc.

what is our amigo behavior @kltm?

Seems there is a desire for exclusion in AC but inclusion in search geneontology/amigo#454