list.sh: support column output #29908

Job	Run time
syntax	42s
cask audit	2m 57s
vendored gems	40s
formula audit	6m 59s
tap syntax	4m 55s
update-test (Ubuntu 22.04)	18s
update-test (macOS 13)	22s
test default formula (Ubuntu 22.04)	4m 27s
tests (online)	8m 54s
test default formula (Ubuntu 20.04)	6m 33s
test default formula (macOS 13 x86_64)	3m 0s
tests (generic OS)	6m 12s
test default formula (macOS 14 arm64)	1m 7s
tests (Ubuntu 22.04)	6m 23s
tests (Ubuntu 20.04)	7m 58s
tests (macOS 13 x86_64)	8m 42s
tests (macOS 14 arm64)	5m 45s
	1h 15m 54s

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