When --rss is used, include an "RSS ratio" column #1727

Job	Run time
benchmark-graph	49s
benchmark-ractor-only (head)	38s
test (truffleruby)	1m 53s
test (ruby)	47s
benchmark-ractor (head)	6m 46s
benchmark-run-once	1m 37s
test (head)	49s
benchmark-default (head)	12m 14s
benchmark-default (ruby)	13m 44s
benchmark-default (truffleruby, --excludes=knucleotide,lobsters,ruby-lsp,shipit)	13m 24s
all-tests	4s
	52m 45s

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