Add run mode skip to cylc show #8646

Job	Run time
1/4	12m 12s
2/4	14m 46s
3/4	11m 53s
4/4	15m 15s
py-3-latest	17m 9s
flaky	6m 51s
_remote_background_indep_poll	4m 58s
_remote_background_indep_tcp	7m 18s
macos 1/5	21m 41s
macos 2/5	17m 23s
codecov	8s
	2h 9m 34s

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