Merge pull request #521 from eightbitraptor/mvh-ractor-harness-improv… #1989

Job	Run time
benchmark-ractor (head)	7m 18s
benchmark-default (truffleruby, --excludes=knucleotide,lobsters,ruby-lsp,shipit)	14m 15s
benchmark-ractor-only (head)	48s
test (head)	47s
benchmark-graph	43s
test (truffleruby)	1m 42s
benchmark-default (ruby)	12m 2s
benchmark-run-once	1m 31s
benchmark-default (head)	12m 47s
test (ruby)	51s
all-tests	2s
	52m 46s

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