Prefer node-local listeners helper in protocol-listener health check

This is a minor change that avoids a cluster-wide query for active
listeners. The old code called `rabbit_networking:active_listeners/0`
and then filtered the results by ones available on the local node. This
caused an RPC and concatenation of all other cluster members' listeners
and then in the next line filtered down to local nodes. Equivalently we
can use `rabbit_networking:node_listeners(node())` which dumps a local
ETS table.

This is not a very impactful change but it's nice to keep the latency of
the health-check handlers low and reduce some unnecessary cluster noise.

Author: the-mikedavis

deps/rabbitmq_management/src/rabbit_mgmt_wm_health_check_protocol_listener.erl

@@ -34,13 +34,12 @@ resource_exists(ReqData, Context) ->
 
 to_json(ReqData, Context) ->
     Protocol = normalize_protocol(protocol(ReqData)),
-    Listeners = rabbit_networking:active_listeners(),
-    Local = [L || #listener{node = N} = L <- Listeners, N == node()],
-    ProtoListeners = [L || #listener{protocol = P} = L <- Local, atom_to_list(P) == Protocol],
+    Listeners = rabbit_networking:node_listeners(node()),
+    ProtoListeners = [L || #listener{protocol = P} = L <- Listeners, atom_to_list(P) == Protocol],
     case ProtoListeners of
         [] ->
             Msg = <<"No active listener">>,
-            failure(Msg, Protocol, [P || #listener{protocol = P} <- Local], ReqData, Context);
+            failure(Msg, Protocol, [P || #listener{protocol = P} <- Listeners], ReqData, Context);
         _ ->
             Body = #{status   => ok,
                      protocol => list_to_binary(Protocol)},