Fix duplicate task triggers #8834

Job	Run time
1/4	13m 1s
2/4	14m 18s
3/4	11m 43s
4/4	17m 27s
py-3-latest	21m 49s
flaky	5m 59s
_remote_background_indep_poll	6m 3s
_remote_background_indep_tcp	7m 32s
macos 1/5	19m 49s
macos 2/5	18m 19s
codecov	11s
	2h 16m 11s

Provide feedback