Redesign the Ractor/Knucleotide benchmark #1544

Job	Run time
test (head)	1m 12s
test (ruby)	1m 14s
benchmark-ractor (ruby)	22m 45s
benchmark-default (head)	11m 5s
benchmark-default (truffleruby)	13m 44s
benchmark-ractor (head)	6m 58s
benchmark-default (ruby)	12m 39s
test (truffleruby)	1m 6s
benchmark-graph	1m 24s
benchmark-ractor-only (head)	35s
benchmark-ractor-only (ruby)	1m 7s
benchmark-run-once	1m 23s
all-tests	5s
	1h 15m 17s

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