Support cross-version overview in stream SAC coordinator

When the state comes from V4 and the current module is V5.

References rabbitmq#14106

Author: acogoluegnes

deps/rabbit/src/rabbit_stream_sac_coordinator.erl

@@ -207,15 +207,17 @@ group_consumers(VirtualHost, Stream, Reference, InfoKeys) ->
 -spec overview(state() | undefined) -> map() | undefined.
 overview(undefined) ->
     undefined;
-overview(#?MODULE{groups = Groups}) ->
+overview(#?MODULE{groups = Groups} = S) when ?IS_STATE_REC(S) ->
     GroupsOverview =
         maps:map(fun(_,
                      #group{consumers = Consumers, partition_index = Idx}) ->
                     #{num_consumers => length(Consumers),
                       partition_index => Idx}
                  end,
                  Groups),
-    #{num_groups => map_size(Groups), groups => GroupsOverview}.
+    #{num_groups => map_size(Groups), groups => GroupsOverview};
+overview(S) ->
+    rabbit_stream_sac_coordinator_v4:overview(S).
 
 -spec init_state() -> state().
 init_state() ->