Optimize / clean up interface kernels to be called only on one side of a sideset

[GiudGiud]

Motivation

to solve #15024, interface kernels are called on both sides of every interface.
The execution ok the ik is prevent when the wrong side is detected.

related to libMesh/libmesh#2494 which would reduce the number of occurences of inconsistently oriented sidesets

Design

Using a future Diagnostics system, make sure sidesets are consistently and well oriented for the IKs first
Error if not

When consistently oriented, we should be able to loop on sides only once, on the right side

Impact

Minor performance improvement expected, only for simulations relying on interface kernels. Interface kernels are executed much less than anything volumetric, so this wont make anything much faster
Minor code cleanup