Sort benchmark definitions alphabetically #1972

Job	Run time
benchmark-default (head)	12m 21s
benchmark-ractor-only (head)	48s
benchmark-run-once	1m 38s
benchmark-ractor (head)	6m 56s
benchmark-graph	49s
benchmark-default (ruby)	11m 56s
test (ruby)	46s
benchmark-default (truffleruby, --excludes=knucleotide,lobsters,ruby-lsp,shipit)	14m 16s
test (head)	54s
test (truffleruby)	1m 55s
all-tests	3s
	52m 22s

Provide feedback