Resolves rapidsai#7554, Depends on rapidsai/cuvs#1610 (CI won't pass until this is merged) What does this PR do? 1. Removes lingering **unused** raft headers that will be deprecated such as `#include <raft/spatial/knn/knn.cuh>`, `#include <raft/distance/distance.cuh>`, etc. 2. ~~Updates to raft::memory_type_from_pointer instead of the deprecated raft::spatial::knn::detail::utils::pointer_residency.~~ 3. Removes `metric_processor` from `knn.hpp` and `knn.cu`. The only special metric processing needed is for correlation distance which we can handle in `knn.cu` instead of using the class from `processing.cuh` from raft. The cosine distance is supported in ivf_flat and ivf_pq in cuvs so we do **not** need to use the innerproduct metric and special processing that was there before. 4. Uses `build_dendrogram_host` from cuvs instead of raft. Authors: - Anupam (https://github.com/aamijar) Approvers: - Victor Lafargue (https://github.com/viclafargue) URL: rapidsai#7561

[TRACKER] Prepare cuml for removal of deprecated raft apis #7554

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