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More robust memory reporting for the Ractor harness #2127

Job	Run time
benchmark-graph	47s
benchmark-ractor-only (head)	1m 50s
benchmark-default (ruby)	11m 55s
benchmark-default (head)	13m 23s
benchmark-ractor (head)	18m 59s
test (ruby)	52s
test (head)	1m 3s
benchmark-default (truffleruby, --excludes=knucleotide,lobsters,ruby-lsp,shipit)	11m 33s
test (truffleruby)	1m 11s
benchmark-run-once	1m 26s
all-tests	4s
	1h 3m 3s