Fix.no validation of outputs from graph singletons #8805

Job	Run time
1/4	2m 7s
2/4	1m 48s
3/4	1m 53s
4/4	2m 15s
py-3-latest	6m 49s
flaky	1m 14s
_remote_background_indep_poll	3m 5s
_remote_background_indep_tcp	3m 4s
macos 1/5	6m 53s
macos 2/5	6m 57s
codecov	1s
	36m 6s

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