[OpenMP][NFC] Move Utils.h and Debug.h into a "Shared" include folder (#73701)

Headers used throughout the different runtimes are different from the
internal headers. This is a first step to bring structure in into the
include folder.

GitOrigin-RevId: 8327f4a851fe45760b12752acd0f3b9c1a64b1f3
24 files changed