Revert "rabbit_db: Disconnect from remote nodes after a failure to cluster"

This reverts commit 4062d2a.

Author: dumbbell

deps/rabbit/src/rabbit_db_cluster.erl

@@ -180,14 +180,6 @@ join(RemoteNode, NodeType)
                 ok ->
                     ok;
                 {error, _} ->
-                    %% Disconnect explicitly from remote nodes that we tried to
-                    %% cluster with, because it way interfere with the restart
-                    %% of RabbitMQ below and peer discovery.
-                    lists:foreach(
-                      fun(Node) ->
-                              _ = erlang:disconnect_node(Node)
-                      end, ClusterNodes),
-
                     %% We reset feature flags states again and make sure the
                     %% recorded states on disk are deleted.
                     rabbit_feature_flags:reset()