Add a new entry_point for xtriggers #6719

Job	Run time
1/4	14m 13s
2/4	13m 23s
3/4	13m 42s
4/4	12m 20s
py-3-latest	18m 16s
flaky	6m 3s
_remote_background_indep_poll	5m 14s
_remote_background_indep_tcp	7m 38s
macos 1/5	23m 55s
macos 2/5	18m 51s
codecov	8s
	2h 13m 43s

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