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CaloRecGPU: Multiprocessing and Cleanup

Nuno Dos Santos Fernandes requested to merge dossantn/athena:assorted-cleanup-and-fixes into main

To ensure we can run with multi-processing, we need to ensure all CUDA-related calls only take place after the fork, which means that we must separate the initialization into non-CUDA and CUDA parts. We ensure each is called at the correct point in a new CaloGPUCUDAInitialization.h base class, though it is a temporary and rather inelegant design to be replaced once/if more comprehensive support for accelerators exists natively in the Athena classes.

Since I was changing things in the classes and initialization, I took the opportunity to also implement the changes that were discussed in !69434 (merged) in regards to the non-defaulted destructors and RECOVERABLE status codes.

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