[Docs] Add core/testsupport to doxygen search path.
[Docs] Add core/testsupport to doxygen search path.

olifre/root,olifre/root,olifre/root,olifre/root,olifre/root,olifre/root,olifre/root,olifre/root,olifre/root,olifre/root,olifre/root