Remove incorrect mapvcat Zygote adjoint (#362) #807

Job	Run time
test (min, ubuntu-latest, Enzyme)	10m 53s
test (min, ubuntu-latest, ForwardDiff)	8m 56s
test (min, ubuntu-latest, Mooncake)	10m 45s
test (min, ubuntu-latest, Tracker)	8m 28s
test (min, ubuntu-latest, ReverseDiff)	8m 52s
test (min, ubuntu-latest, Zygote)	9m 14s
test (min, macOS-latest, Enzyme)	6m 38s
test (min, macOS-latest, ForwardDiff)	5m 14s
test (min, macOS-latest, Mooncake)	7m 49s
test (min, macOS-latest, Tracker)	5m 12s
test (min, macOS-latest, ReverseDiff)	5m 27s
test (min, macOS-latest, Zygote)	6m 10s
test (1, ubuntu-latest, Enzyme)	12m 56s
test (1, ubuntu-latest, ForwardDiff)	10m 48s
test (1, ubuntu-latest, Mooncake)	13m 6s
test (1, ubuntu-latest, Tracker)	9m 45s
test (1, ubuntu-latest, ReverseDiff)	10m 20s
test (1, ubuntu-latest, Zygote)	11m 12s
test (1, macOS-latest, Enzyme)	9m 17s
test (1, macOS-latest, ForwardDiff)	6m 52s
test (1, macOS-latest, Mooncake)	9m 20s
test (1, macOS-latest, Tracker)	6m 30s
test (1, macOS-latest, ReverseDiff)	6m 42s
test (1, macOS-latest, Zygote)	7m 5s
	3h 27m 31s

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