GPU: Provide general GPUChkErr functionality also externally and several unrelated changes

[davidrohr]

@mconcas : Sorry this took so long :(.
This adds a GPUCommonChkErr.h header, providing my GPUChkErr macros.
Currently, they must be used upon a GPUReconstruction object.
The reason is that I need to dispatch to the backend to get the errorcodes, so I could not easily make it static.

Would this work for you?

I could probably create a static version, which would automatically detect which GPUReconstruction class is created first, and attach to that, and then dispatch to that.
That should in principle cover all use cases, except for if someone would use multiple backends in the same application, which is in principle supported.

[github-actions]

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[alibuild]

Error while checking build/O2/fullCI_slc9 for 061b880 at 2025-03-14 09:52:

## sw/BUILD/O2-latest/log
ld.lld: error: undefined symbol: o2::gpu::GPUReconstructionHIPBackend::GPUChkErrStatic(long, char const*, int)
clang++: error: linker command failed with exit code 1 (use -v to see invocation)
ninja: build stopped: subcommand failed.

Full log here.

[davidrohr]

@mconcas : You should be able to use GPUChkErrS and GPUChkErrSI statically, if you link against the external provider.