Get rid of functors for second order #923

Job	Run time
1 - DIT (Formalities)	2m 2s
1 - DIT (Zero)	4m 7s
1 - DIT (ForwardDiff)	3m 29s
1 - DIT (Weird)	9m 49s
lts - DIT (Zero)	3s
1 - DI (Formalities)	1m 33s
lts - DIT (ForwardDiff)	3s
1 - DI (Internals)	6m 16s
pre - DIT (Formalities)	6s
1 - DI (Back/ChainRulesCore)	5m 31s
pre - DIT (Zero)	3s
1 - DI (Back/Diffractor)	1m 56s
pre - DIT (ForwardDiff)	11s
1 - DI (Back/Enzyme)	9m 49s
pre - DIT (Weird)	3s
1 - DI (Back/FastDifferentiation)	3m 43s
1 - DI (Back/FiniteDiff)	2m 12s
1 - DI (Back/FiniteDifferences)	2m 16s
1 - DI (Back/ForwardDiff)	7m 10s
1 - DI (Back/PolyesterForwardDiff)	2m 49s
1 - DI (Back/ReverseDiff)	5m 24s
1 - DI (Back/SecondOrder)	5m 8s
1 - DI (Back/Symbolics)	3m 18s
1 - DI (Back/Tapir)	3m 23s
1 - DI (Back/Tracker)	2m 8s
1 - DI (Back/Zygote)	4m 25s
1 - DI (Down/Detector)	2m 14s
1 - DI (Down/DifferentiateWith)	2m 47s
1 - DI (Down/Flux)	3m 39s
1 - DI (Down/Lux)	5m 29s
lts - DI (Internals)	4s
lts - DI (Back/FiniteDifferences)	3s
lts - DI (Back/ForwardDiff)	3s
lts - DI (Back/ReverseDiff)	4s
lts - DI (Back/Tracker)	4s
lts - DI (Back/Zygote)	3s
lts - DI (Down/DifferentiateWith)	4s
pre - DI (Internals)	5s
pre - DI (Back/Diffractor)	5s
pre - DI (Back/FastDifferentiation)	6s
pre - DI (Back/FiniteDiff)	6s
pre - DI (Back/FiniteDifferences)	4s
pre - DI (Back/ForwardDiff)	10s
pre - DI (Back/PolyesterForwardDiff)	4s
pre - DI (Back/ReverseDiff)	4s
pre - DI (Back/Symbolics)	5s
pre - DI (Back/Tracker)	5s
pre - DI (Back/Zygote)	3s
pre - DI (Down/DifferentiateWith)	4s
pre - DI (Down/Flux)	7s
pre - DI (Down/Lux)	6s
	1h 42m 45s

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