cuco isn't a cudf dependency when we are built shared (#10662)

With the corrections in #10545 we didn't install the cuco headers / cmake files as they aren't needed for shared builds. But we forgot to remove the `find_package(cuco)` call from the generated cudf-config.cmake.

Authors:
  - Robert Maynard (https://github.com/robertmaynard)

Approvers:
  - Paul Taylor (https://github.com/trxcllnt)
  - Vyas Ramasubramani (https://github.com/vyasr)

URL: #10662

cpp/cmake/thirdparty/get_cucollections.cmake

@@ -21,12 +21,14 @@ function(find_and_configure_cucollections)
     cuco 0.0.1
     GLOBAL_TARGETS cuco::cuco
     BUILD_EXPORT_SET cudf-exports
-    INSTALL_EXPORT_SET cudf-exports
     CPM_ARGS GITHUB_REPOSITORY NVIDIA/cuCollections
     GIT_TAG fb58a38701f1c24ecfe07d8f1f208bbe80930da5
     EXCLUDE_FROM_ALL ${BUILD_SHARED_LIBS}
     OPTIONS "BUILD_TESTS OFF" "BUILD_BENCHMARKS OFF" "BUILD_EXAMPLES OFF"
   )
+  if(NOT BUILD_SHARED_LIBS)
+    rapids_export_package(INSTALL cuco cudf-exports)
+  endif()
 
 endfunction()