Change uses of "Hair" in Render Settings UI in the property editor and the "Hair Info" node to use the "Curves" name to reflect the design described in T95355, where hair is just a use case of a more general curves data type. While these settings still affect the particle hair system, the idea is that if we have to choose one naming scheme to align with, we should choose the option that aligns with future plans and current development efforts, especially since the particle system is considered a legacy feature. A few notes: - "Principled Hair BSDF" is not affected since it's meant for hair. - Python API property identifiers are not affected. Differential Revision: https://developer.blender.org/D14573