Skip test_rg_update_cpg due to flakyness, need to revisit before GA

Author: a-hilaly

Diff for: test/e2e/tests/test_replicationgroup.py

@@ -680,6 +680,8 @@ def test_rg_associate_resources(self, rg_associate_resources_input, rg_associate
         # assert new state
         assert_associated_resources(rg_associate_resources_input['RG_ID'], sg_list, sns_topic, ug_list)
 
+    # hard flakes on this test, needs to be fixed
+    @pytest.mark.skip(reason="Flaky test")
     def test_rg_update_cpg(self, rg_update_cpg_input, rg_update_cpg, bootstrap_resources):
         # wait for resource to sync and retrieve initial state
         (reference, _) = rg_update_cpg