Optionally interleave benchmarks base/experiment #1732

Job	Run time
benchmark-graph	42s
benchmark-default (truffleruby, --excludes=knucleotide,lobsters,ruby-lsp,shipit)	13m 7s
benchmark-ractor (head)	6m 52s
benchmark-run-once	1m 41s
benchmark-default (ruby)	13m 57s
benchmark-ractor-only (head)	41s
test (ruby)	53s
test (head)	43s
benchmark-default (head)	13m 16s
test (truffleruby)	1m 45s
all-tests	3s
	53m 40s

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