Get more consistent distributions in parallel scenarios test #8451
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Note that this is not denoising the individual runtimes. The point of the test is to measure a distribution of runtimes for a variety of scenarios. This PR takes more samples for each distribution, and spreads the samples out over time to dodge transitory OS stuff by interleaving different test scenarios.
I also tweaked some of the scenarios to be more useful, and reported actual deciles so that the median is actually there.