Skip additional tests in mixed versions

The tests in question won't pass consistently as they are at the mercy
of how the quorum queue is placed across the mixed version nodes

Author: HoloRin

deps/rabbit/test/quorum_queue_SUITE.erl

@@ -279,6 +279,10 @@ init_per_testcase(Testcase, Config) ->
             {skip, "delete_immediately_by_resource isn't mixed versions compatible"};
         queue_ttl when IsMixed andalso ClusterSize == 3 ->
             {skip, "queue_ttl isn't mixed versions compatible"};
+        start_queue when IsMixed andalso ClusterSize == 5 ->
+            {skip, "start_queue isn't mixed versions compatible"};
+        start_queue_concurrent when IsMixed andalso ClusterSize == 5 ->
+            {skip, "start_queue_concurrent isn't mixed versions compatible"};
         _ ->
             Config1 = rabbit_ct_helpers:testcase_started(Config, Testcase),
             rabbit_ct_broker_helpers:rpc(Config, 0, ?MODULE, delete_queues, []),