Move all code in run_benchmarks.rb to CLI.run method #1503

Job	Run time
benchmark-ractor (truffleruby)	17s
benchmark-ractor (ruby)	12m 45s
test (truffleruby)	1m 8s
benchmark-ractor (head)	12m 25s
test (head)	56s
test (ruby)	1m 10s
benchmark-default (ruby)	10m 24s
benchmark-default (truffleruby)	28s
benchmark-run-once	1m 34s
benchmark-default (head)	11m 1s
benchmark-graph	47s
benchmark-ractor-only (ruby)	54s
benchmark-ractor-only (truffleruby)	11s
benchmark-ractor-only (head)	52s
all-tests	3s
	54m 55s

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