Improve `--report=terms` command #1312

Job	Run time
steep-check (head)	18s
test-memory (head)	45s
check-misc (head)	5s
test-windows (head)	1m 48s
test-ruby (head, master)	5m 50s
test-ruby (3.0, master)	5m 37s
ruby-versions / Generate Ruby versions	3s
test (2.5)	26s
test (2.6)	24s
test (2.7)	28s
test (3.0)	16s
test (3.1)	11s
test (3.2)	15s
test (3.3)	14s
test (head)	10s
	16m 50s

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