Sort benchmark definitions alphabetically #1971

Job	Run time
test (head)	46s
benchmark-ractor (head)	7m 2s
test (truffleruby)	1m 40s
benchmark-graph	37s
benchmark-default (truffleruby, --excludes=knucleotide,lobsters,ruby-lsp,shipit)	12m 59s
benchmark-default (head)	12m 48s
test (ruby)	1m 13s
benchmark-default (ruby)	11m 59s
benchmark-ractor-only (head)	50s
benchmark-run-once	1m 37s
all-tests	3s
	51m 34s

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