Subdomain modifiers should be able to assign different blocks for different element types

[GiudGiud]

Motivation

in #27583 a user is seeing errors on exodus output after using the CoupledVarThreshdoldSubdomain modifier on their mixed element mesh

Design

More parameters, for every element type?
Maybe just two vectors?

OR
a suffix with the element type?

Impact

Easier time using subdomain modifiers on mixed element meshes