Improve `--report` option #1329

Job	Run time
steep-check (head)	22s
check-misc (head)	7s
test-memory (head)	34s
test-ruby (head, master)	5m 46s
test-ruby (3.0, master)	5m 44s
test-windows (head)	2m 8s
ruby-versions / Generate Ruby versions	3s
test (2.5)	26s
test (2.6)	25s
test (2.7)	27s
test (3.0)	13s
test (3.1)	10s
test (3.2)	14s
test (3.3)	12s
test (head)	14s
	17m 5s

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