Replace all of Boulder's usage of the Go stdlib "math/rand" package with
the newer "math/rand/v2" package which first became available in go1.22.
This package has an improved API and faster performance across the
board.
See https://go.dev/blog/randv2 and https://go.dev/blog/chacha8rand for
details.
Enable the errcheck linter. Update the way we express exclusions to use
the new, non-deprecated, non-regex-based format. Fix all places where we
began accidentally violating errcheck while it was disabled.
In live.go we use a semaphore to limit how many inflight signing
requests we can have, so a flood of OCSP traffic doesn't flood our CA
instances. If traffic exceeds our capacity to sign responses for long
enough, we want to eventually start fast-rejecting inbound requests that
are unlikely to get serviced before their deadline is reached. To do
that, add a MaxSigningWaiters config field to the OCSP responder.
Note that the files in //semaphore are forked from x/sync/semaphore,
with modifications to add the MaxWaiters field and functionality.
Fixes#6392
Aaron Gable
Jacob Hoffman-Andrews