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Separate harness implementation from the harness framework #2168

Job	Run time
benchmark-run-once	1m 27s
benchmark-default (ruby)	8m 25s
benchmark-ractor (head)	15m 13s
test (ruby)	1m 2s
benchmark-graph	40s
test-windows (head)	1m 28s
benchmark-default (head)	13m 22s
test-windows (ruby)	1m 57s
benchmark-default-windows (ruby)	23m 30s
benchmark-default (truffleruby, --excludes=knucleotide,lobsters,ruby-lsp,shipit)	7m 30s
test (truffleruby)	1m 50s
benchmark-default-windows (head)	37m 50s
test (head)	1m 3s
benchmark-ractor-only (head)	1m 21s
all-tests	4s
	1h 56m 42s