feat: log errors from cudaGetDeviceCount (PROOF-924) #209
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Rationale for this change
Log errors from cudaGetDeviceCount to make it easier to track down any issues if the gpu backend fails to initialize.
What changes are included in this PR?
Are these changes tested?
Nothing specific for the new code since it would require trigger a failure for cudaGetDeviceCount, but risk of the new code should be minimal.