get_cucollections properly uses rapids_cpm_find (#9189)

When #9030 was merged it incorrectly resolved `get_cucollections.cmake` to use features of `rapids_cpm_find` but still call `CPMFindPackage`. This corrects the issues by properly calling `rapids_cpm_find`.

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

Approvers:
  - Keith Kraus (https://github.com/kkraus14)
  - Mark Harris (https://github.com/harrism)

URL: #9189

cpp/cmake/thirdparty/get_cucollections.cmake

@@ -16,12 +16,8 @@
 
 function(find_and_configure_cucollections)
 
-    if(TARGET cuco::cuco)
-        return()
-    endif()
-
     # Find or install cuCollections
-    CPMFindPackage(NAME   cuco
+    rapids_cpm_find(cuco 0.0
         GLOBAL_TARGETS cuco::cuco
         CPM_ARGS
             GITHUB_REPOSITORY NVIDIA/cuCollections