bench: Remove requirement that all benches use same testing setup #18575
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The benches have always set up one global testing setup. This makes it hard to pick no testing setup at all or one with different params.
Fix this by removing any global state setup from the main
bench.cppand leave the setup to each individual bench.One reason to have one global testing setup is to set the datadir location to a tempdir to avoid reading or writing in the default datadir location. But #13687 should prevent this already.