Add option for GPU running and set up tests (EFTRACK-262)
New flag to run GPU algorithms in the trigger. In principle this could be made more configurable but in practice I think the only thing we have ready is CUDA FTF seeding, in both ITk and Run-3 geometry mode.
Also add ART grid tests running these. These should execute on queues with NVidia architecture. Following example of CaloRecGPU.