Build BenchmarkSuite only once per CLI run #1532

Job	Run time
benchmark-ractor-only (ruby)	56s
benchmark-ractor-only (head)	43s
benchmark-default (head)	11m 18s
benchmark-default (ruby)	11m 3s
benchmark-default (truffleruby)	15m 12s
test (truffleruby)	1m 3s
test (head)	1m 0s
test (ruby)	1m 6s
benchmark-ractor (head)	12m 19s
benchmark-ractor (ruby)	12m 56s
benchmark-run-once	1m 33s
benchmark-graph	48s
all-tests	3s
	1h 10m 0s

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