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Run each ractor count benchmark in it's own process #2106

Job	Run time
benchmark-ractor (head)	18m 28s
test (truffleruby)	1m 31s
benchmark-run-once	1m 24s
benchmark-default (ruby)	13m 57s
benchmark-graph	41s
test (head)	41s
benchmark-default (head)	14m 1s
benchmark-default (truffleruby, --excludes=knucleotide,lobsters,ruby-lsp,shipit)	11m 57s
benchmark-ractor-only (head)	1m 31s
test (ruby)	1m 0s
all-tests	3s
	1h 5m 14s