Handle abstract recipes with EVL tail folding

From this comment https://github.com/llvm/llvm-project/issues/123069#issuecomment-3104232027

We currently have a bail out that prevents us from running VPlanTransforms::convertToAbstractRecipes with EVL tail folding, which in turn prevents partial reductions from being vectorized.