Fix tests by using tag types instead of instances #768
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I noticed that in some tests currently tag instances are used as type parameters of
Dualnumbers, even though ForwardDiff is based on using tag types. Changing tests from tag instances to tag types seems to fix a few broken tests.Edit: It seems actually this PR fixes all broken tests, on the latest commit on master CI showed 20 broken tests (e.g. https://github.com/JuliaDiff/ForwardDiff.jl/actions/runs/17241011162/job/48917940673#step:6:144) whereas on this PR CI shows no broken tests anymore (https://github.com/JuliaDiff/ForwardDiff.jl/actions/runs/17444517109/job/49535515574#step:6:165).