xtrigger: ui support #9255

Job	Run time
4/4	14m 44s
py-3-latest	19m 0s
1/4	12m 7s
3/4	11m 19s
_remote_background_indep_tcp	7m 26s
2/4	13m 11s
_remote_background_indep_poll	4m 32s
macos 1/5	1m 4s
macos 2/5	20m 58s
flaky	5m 47s
codecov	0s
macos 1/5	21m 37s
4/4	14m 44s
3/4	11m 19s
flaky	5m 47s
_remote_background_indep_poll	4m 32s
py-3-latest	19m 0s
_remote_background_indep_tcp	7m 26s
2/4	13m 11s
1/4	12m 7s
macos 2/5	20m 58s
codecov	11s
	4h 1m 0s

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