Go back to `useQuery` for query editor requests

[kmcginnes]

I switched the logic to useMutation to ensure only one fetch request will fire per button click. We need this guarantee to ensure mutations do not unintentionally get executed multiple times. But useMutation has made the logic around the query quite a mess.

Typically useQuery will perform background fetches to freshen up the data stored in cache. There are flags to turn all of these off. I think I have the proper set of them now to give this another shot.