Fix issues around scaleability and Runegraft of the Bound

Revisiting this code when looking over this PR makes me realize there are a few more hidden gotchas here.

1. Making a mod unscalable in a LIST mod doesn't do anything. An example of this would be "banners also cause enemies to take (%d+)%% increased damage". This code only checks for unscalable at the LIST level, not for each subMod: https://github.com/PathOfBuildingCommunity/PathOfBuilding/blob/78326a60910b00739c5f33be69cb140cd164a12c/src/Classes/ModStore.lua#L37-L50
2. Unscaleable mods get added twice. I tested "take no extra damage from critical strikes" and saw the value double (even though there is a hard cap on a lot of these unscalable mods

In short, I'll merge this PR but I needed to write this down somewhere so it can be refactored again, with proper test cases added for all these corner cases.

Originally posted by @Wires77 in https://github.com/PathOfBuildingCommunity/PathOfBuilding/issues/8977#issuecomment-3251710545

Commencez dans src/Classes/ModStore.lua au niveau de la scaleability logic liée et suivez le traitement des LIST mods et des unscalable mods. Ajoutez des cas de test pour la gestion de unscalable par subMod et l’application en double, puis vérifiez que les modifiers concernés produisent les valeurs attendues sans double comptage.