Disabling expanded fused l2 knn to unblock cuml CI (#404)

We will enable this again once cuml's tests are passing w/ the changes.

Authors:
  - Corey J. Nolet (https://github.com/cjnolet)

Approvers:
  - Dante Gama Dessavre (https://github.com/dantegd)

URL: #404

cpp/include/raft/spatial/knn/detail/knn_brute_force_faiss.cuh

@@ -293,11 +293,13 @@ void brute_force_knn_impl(
 
     cudaStream_t stream = raft::select_stream(userStream, internalStreams, n_int_streams, i);
 
+    // TODO: Enable this once we figure out why it's causing pytest failures in cuml.
     if (k <= 64 && rowMajorQuery == rowMajorIndex && rowMajorQuery == true &&
         (metric == raft::distance::DistanceType::L2Unexpanded ||
-         metric == raft::distance::DistanceType::L2SqrtUnexpanded ||
-         metric == raft::distance::DistanceType::L2Expanded ||
-         metric == raft::distance::DistanceType::L2SqrtExpanded)) {
+         metric == raft::distance::DistanceType::L2SqrtUnexpanded  //||
+         //             metric == raft::distance::DistanceType::L2Expanded ||
+         //             metric == raft::distance::DistanceType::L2SqrtExpanded)
+         )) {
       fusedL2Knn(D,
                  out_i_ptr,
                  out_d_ptr,