CCCL is tested in release build and by default assert is compiled out
In hierarchy testing device side uses assert for convinient printing and termination,
we do #indef NDEBUG to make the asserts stay.
Recently I wanted to remove on extremally long running test from debug builds,
but because of the #undef NDEBUG it was difficult to detect a debug build.
I decided to just switch to a custom assert implementation and remove the #undef.
This has another benefit that we could do warp aggregate error printing for easier
readible logs etc in the future.

Co-authored-by: Bernhard Manfred Gruber <[email protected]>