Add ZJIT to benchmark runner (#466) #1666

Job	Run time
test (head)	55s
benchmark-default (truffleruby, --excludes=knucleotide,lobsters,railsbench,ruby-lsp,shipit)	12m 26s
test (ruby)	54s
test (truffleruby)	1m 45s
benchmark-graph	54s
benchmark-default (ruby)	13m 29s
benchmark-run-once	1m 50s
benchmark-ractor-only (head)	36s
benchmark-default (head)	13m 56s
benchmark-ractor (head)	6m 47s
all-tests	2s
	53m 34s

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