Fix an OOB error in device-side cuvs::neighbors::refine and CAGRA kern_prune #460
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IVF-Flat index expects all valid indices during build, which may not be the case in the context of refinement.
At the same time,
cagra::detail::graph::kern_prunefails with OOB error if some indices are invalid.This PR tweaks both kernels to avoid touching the input data with an invalid index.
Fixes #337