Add run mode skip to cylc show #8651

Job	Run time
1/4	12m 16s
2/4	13m 39s
3/4	11m 57s
4/4	14m 29s
py-3-latest	16m 27s
flaky	6m 9s
_remote_background_indep_poll	5m 7s
_remote_background_indep_tcp	7m 4s
macos 1/5	20m 0s
macos 2/5	18m 0s
codecov	8s
	2h 5m 16s

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