[UR][CUDA] Refactor reference counting in UR CUDA adapter using new ur::RefCount class #19287
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For #18644
Most UR adapters had their own reference counting of some sort. This adds a new RefCount class and refactors adapter code so all adapters can share the same code for reference counting. This PR handles CUDA and I will open more PRs for each adapter in turn.
I have kept the pre-existing reference counting members inside
stream_queue.hpp, temporarily renaming it asRefCountOldas the HIP adapter also uses this and want to only change one adapter per PR. I will revert this once the last of the HIP and CUDA PRs are merged.