Test duplicate rejected updates #1857

Job	Run time
build-and-test (ubuntu-latest, oldstable)	16m 59s
build-and-test (ubuntu-latest, stable)	25m 14s
cloud-test	0s
build-and-test (macos-intel, oldstable)	18m 48s
build-and-test (macos-intel, stable)	18m 9s
build-and-test (macos-arm, oldstable)	17m 17s
build-and-test (macos-arm, stable)	17m 14s
build-and-test (windows-latest, oldstable)	23m 3s
build-and-test (windows-latest, stable)	22m 44s
features-test / test	1m 35s
	2h 41m 3s

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