Fix build error with NO_CUGRAPH_OPS (#4563)

Closes #4554, user bug found building cugraph 24.10

Authors:
  - Seunghwa Kang (https://github.com/seunghwak)

Approvers:
  - Chuck Hastings (https://github.com/ChuckHastings)

URL: #4563

cpp/src/prims/detail/sample_and_compute_local_nbr_indices.cuh

@@ -1573,11 +1573,11 @@ uniform_sample_and_compute_local_nbr_indices(
   size_t K,
   bool with_replacement)
 {
+  using edge_t = typename GraphViewType::edge_type;
 #ifndef NO_CUGRAPH_OPS
   assert(cugraph::invalid_edge_id_v<edge_t> == cugraph::ops::graph::INVALID_ID<edge_t>);
 
   using vertex_t = typename GraphViewType::vertex_type;
-  using edge_t   = typename GraphViewType::edge_type;
   using key_t    = typename thrust::iterator_traits<KeyIterator>::value_type;
 
   int minor_comm_size{1};