Don't test on 'lts' and 'pre' for draft PRs #592

Job	Run time
1 - DIT (Formalities)	2m 31s
1 - DI (Formalities)	1m 39s
1 - DIT (Zero)	10m 58s
1 - DIT (ForwardDiff)	3m 36s
1 - DI (Internals)	5m 34s
1 - DIT (Weird)	7m 19s
1 - DI (Back/Diffractor)	2m 9s
lts - DIT (Zero)	7s
1 - DI (Back/Enzyme)	21m 15s
1 - DI (Back/FastDifferentiation)	3m 33s
lts - DIT (ForwardDiff)	3s
pre - DIT (Formalities)	3s
1 - DI (Back/FiniteDiff)	2m 25s
pre - DIT (Zero)	4s
1 - DI (Back/FiniteDifferences)	2m 24s
pre - DIT (ForwardDiff)	7s
1 - DI (Back/ForwardDiff)	8m 52s
pre - DIT (Weird)	7s
1 - DI (Back/PolyesterForwardDiff)	2m 43s
1 - DI (Back/ReverseDiff)	6m 16s
1 - DI (Back/SecondOrder)	5m 38s
1 - DI (Back/Symbolics)	3m 24s
1 - DI (Back/Tapir)	6m 56s
1 - DI (Back/Tracker)	2m 1s
1 - DI (Back/Zygote)	4m 58s
1 - DI (Down/Detector)	2m 34s
1 - DI (Down/DifferentiateWith)	2m 31s
1 - DI (Down/Flux)	4m 3s
lts - DI (Internals)	6s
lts - DI (Back/FiniteDifferences)	4s
lts - DI (Back/ForwardDiff)	3s
lts - DI (Back/ReverseDiff)	6s
lts - DI (Back/Tracker)	3s
lts - DI (Back/Zygote)	3s
lts - DI (Down/DifferentiateWith)	7s
pre - DI (Internals)	3s
pre - DI (Back/Diffractor)	4s
pre - DI (Back/FastDifferentiation)	6s
pre - DI (Back/FiniteDiff)	3s
pre - DI (Back/FiniteDifferences)	3s
pre - DI (Back/ForwardDiff)	8s
pre - DI (Back/PolyesterForwardDiff)	7s
pre - DI (Back/ReverseDiff)	3s
pre - DI (Back/Symbolics)	3s
pre - DI (Back/Tracker)	7s
pre - DI (Back/Zygote)	7s
pre - DI (Down/DifferentiateWith)	7s
pre - DI (Down/Flux)	3s
	1h 55m 26s

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