kvserver: consistency checker cleanups, pt 1 #76841
Merged
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Thinking through our recent problems with pile-up of sha512 computations again,
I would like to touch up this code somewhat to give the "waiter" the option to
cancel the inflight computation when it gives up waiting. I realized a bit of
preliminary clean-up was in order before I do that. There might be more
clean-up after this PR.
Release note: None