benchmark: use much smaller values for n in some http tests
Checklist
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make -j4 test
(UNIX), orvcbuild test
(Windows) passes -
commit message follows commit guidelines
Affected core subsystem(s)
benchmark
The n values here are really, really high right now, and we can still get high confidence (3 stars) with this much lower n value. This makes the benchmarks run a lot faster without sacrificing accuracy.