fix: speed up Mooncake reverse mode with selective zeroing #2357

Job	Run time
1.11 - DIT (Standard)	20m 28s
1.11 - DIT (Formalities)	8m 0s
1.11 - DIT (Weird)	14m 4s
1.11 - DIT (Zero)	13m 1s
1.11 - DI (Core/Internals)	2m 15s
1.11 - DI (Back/SparsityDetector)	5m 50s
1.11 - DI (Back/DifferentiateWith)	9m 21s
1.11 - DI (Core/SimpleFiniteDiff)	41m 9s
1.11 - DI (Core/ZeroBackends)	13m 22s
1.11 - DI (Back/FiniteDiff)	15m 59s
1.11 - DI (Back/Enzyme)	38m 42s
1.11 - DI (Back/FastDifferentiation)	16m 50s
1.11 - DI (Back/Mooncake)	17m 50s
1.11 - DI (Back/ForwardDiff)	28m 32s
1.11 - DI (Back/Tracker)	7m 29s
1.11 - DI (Back/FiniteDifferences)	8m 45s
1.11 - DI (Back/PolyesterForwardDiff)	15m 14s
1.11 - DI (Back/ReverseDiff)	20m 59s
1.11 - DI (Back/GTPSA)	11m 30s
1.11 - DI (Back/Symbolics)	16m 0s
1.11 - DI (Back/Zygote)	11m 58s
	5h 37m 18s

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