cat-log: list out/err files when available via tailer #8642

Job	Run time
1/4	2m 3s
2/4	4m 52s
3/4	4m 16s
4/4	1m 30s
py-3-latest	1s
flaky	1m 1s
_remote_background_indep_poll	2m 3s
_remote_background_indep_tcp	22s
macos 1/5	4m 55s
macos 2/5	4m 55s
codecov	1s
	25m 59s

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