Fix duplicate job submissions. #7935

Job	Run time
1/4	12m 12s
2/4	14m 41s
3/4	12m 47s
4/4	15m 44s
py-3-latest	19m 35s
flaky	6m 28s
_remote_background_indep_poll	5m 4s
_remote_background_indep_tcp	7m 3s
macos 1/5	17m 40s
macos 2/5	19m 13s
codecov	13s
	2h 10m 40s

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