Re-enable balanced edge cut test (#4781)

Depends on rapidsai/raft#2507

We disabled the test because it was failing and blocking everything in CI.  The above raft PR reverts a change in raft that appears to be causing this failure.  Once it is merged we can merge this to enable the test again.

Closes #4777

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

Approvers:
  - Bradley Dice (https://github.com/bdice)
  - Seunghwa Kang (https://github.com/seunghwak)

URL: #4781

cpp/tests/community/balanced_edge_test.cpp

@@ -15,7 +15,7 @@
 #include <rmm/device_vector.hpp>
 #include <rmm/exec_policy.hpp>
 
-TEST(balanced_edge, DISABLED_success)
+TEST(balanced_edge, success)
 {
   std::vector<int> off_h = {0,  16,  25,  35,  41,  44,  48,  52,  56,  61,  63, 66,
                             67, 69,  74,  76,  78,  80,  82,  84,  87,  89,  91, 93,