rabbit_stream_partitions_SUITE: Use per-testcase RabbitMQ node names

[Why]
The tests are configured to use the same cluster of RabbitMQ nodes but
recreate the cluster for every tests.

This leads to the nodes being unclustered and clustered again abruptly
becauase rabbit_ct_broker_helpers assumes that nodes are unclustered
when it clusters them. One symptom is the coordinator which becomes
unavailable after the first test:

    [warning] <0.969.0> Coordinator timeout on server 'rmq-ct-cluster-2-21054@localhost' when processing command new_stream
    [debug] <0.692.0> RabbitMQ metadata store: follower leader cast - redirecting to {rabbitmq_metadata,'rmq-ct-cluster-2-21054@localhost'}
    [debug] <0.969.0> rabbit_stream_reader terminating in state 'open' with reason '{case_clause,{protocol_error,internal_error,[67,97,110,110|...],[[113,117|...],'rmq-ct-cluster-1-21000@localhost',{...}]}}'
    [error] <0.969.0> ** State machine <0.969.0> terminating
    [error] <0.969.0> ** Last event = {info,{tcp,#Port<0.99>,
    [error] <0.969.0>                            <<0,0,0,19,0,13,0,1,0,0,0,1,0,5,100,117,109,109,
    [error] <0.969.0>                              121,0,0,0,0>>}}
    [error] <0.969.0> ** When server state  = {open,
    [error] <0.969.0>                          {statem_data,ranch_tcp,
    [error] <0.969.0>                           {stream_connection,
    [error] <0.969.0>                            <<"127.0.0.1:39542 -> 127.0.0.1:21015">>,
    [error] <0.969.0>                            {0,0,0,0,0,65535,32512,1},
    [error] <0.969.0>                            {0,0,0,0,0,65535,32512,1},
    [error] <0.969.0>                            21015,39542,
    [error] <0.969.0>                            {<<"PLAIN">>,rabbit_auth_mechanism_plain},
    [error] <0.969.0>                            done,1761145223725,<0.968.0>,#Port<0.99>,#{},#{},
    [error] <0.969.0>                            #{},#{},#Ref<0.2113571418.668598274.3149>,
    [error] <0.969.0>                            {user,<<"guest">>,
    [error] <0.969.0>                             [administrator],
    [error] <0.969.0>                             [{rabbit_auth_backend_internal,
    [error] <0.969.0>                               #Fun<rabbit_auth_backend_internal.3.18474459>}]},
    [error] <0.969.0>                            <<"/">>,opened,1048576,0,
    [error] <0.969.0>                            {none,none},
    [error] <0.969.0>                            #{},#{},
    [error] <0.969.0>                            {state,none,5000,undefined},
    [error] <0.969.0>                            false,#Ref<0.2113571418.668598274.3150>,tcp,
    [error] <0.969.0>                            undefined,0,#{},2,60000,undefined,0,undefined},
    [error] <0.969.0>                           {stream_connection_state,
    [error] <0.969.0>                            {rabbit_stream_core,{cfg},[],undefined,{[],[]}},
    [error] <0.969.0>                            false,#{}},
    [error] <0.969.0>                           {configuration,50000,12500,1048576,60,10000}}}
    [error] <0.969.0> ** Reason for termination = error:{case_clause,
    [error] <0.969.0>                                    {protocol_error,internal_error,
    [error] <0.969.0>                                     "Cannot declare ~ts on node '~ts': ~255p",
    [error] <0.969.0>                                     ["queue 'dummy' in vhost '/'",
    [error] <0.969.0>                                      'rmq-ct-cluster-1-21000@localhost',
    [error] <0.969.0>                                      {error,coordinator_unavailable}]}}
    [error] <0.969.0> ** Callback modules = [rabbit_stream_reader]
    [error] <0.969.0> ** Callback mode = [state_functions,state_enter]
    [error] <0.969.0> ** Stacktrace =
    [error] <0.969.0> **  [{rabbit_stream_manager,do_create_stream,4,
    [error] <0.969.0>                             [{file,"rabbit_stream_manager.erl"},{line,537}]},
    [error] <0.969.0>      {rabbit_stream_reader,handle_frame_post_auth,4,
    [error] <0.969.0>                            [{file,"rabbit_stream_reader.erl"},{line,2158}]},
    [error] <0.969.0>      {lists,foldl,3,[{file,"lists.erl"},{line,2466}]},
    [error] <0.969.0>      {rabbit_stream_reader,open,3,
    [error] <0.969.0>                            [{file,"rabbit_stream_reader.erl"},{line,689}]},
    [error] <0.969.0>      {gen_statem,loop_state_callback,11,[{file,"gen_statem.erl"},{line,3748}]},
    [error] <0.969.0>      {proc_lib,init_p_do_apply,3,[{file,"proc_lib.erl"},{line,333}]}]
    [error] <0.969.0>
    [error] <0.969.0>   crasher:
    [error] <0.969.0>     initial call: rabbit_stream_reader:init/1
    [error] <0.969.0>     pid: <0.969.0>
    [error] <0.969.0>     registered_name: []
    [error] <0.969.0>     exception error: no case clause matching
    [error] <0.969.0>                      {protocol_error,internal_error,
    [error] <0.969.0>                                      "Cannot declare ~ts on node '~ts': ~255p",
    [error] <0.969.0>                                      ["queue 'dummy' in vhost '/'",
    [error] <0.969.0>                                       'rmq-ct-cluster-1-21000@localhost',
    [error] <0.969.0>                                       {error,coordinator_unavailable}]}
    [error] <0.969.0>       in function  rabbit_stream_manager:do_create_stream/4 (rabbit_stream_manager.erl:537)
    [error] <0.969.0>       in call from rabbit_stream_reader:handle_frame_post_auth/4 (rabbit_stream_reader.erl:2158)
    [error] <0.969.0>       in call from lists:foldl/3 (lists.erl:2466)
    [error] <0.969.0>       in call from rabbit_stream_reader:open/3 (rabbit_stream_reader.erl:689)
    [error] <0.969.0>       in call from gen_statem:loop_state_callback/11 (gen_statem.erl:3748)
    [error] <0.969.0>     ancestors: [<0.967.0>,<0.874.0>,<0.873.0>,<0.872.0>,<0.870.0>,<0.869.0>,
    [error] <0.969.0>                   rabbit_stream_sup,<0.866.0>]
    [error] <0.969.0>     message_queue_len: 0
    [error] <0.969.0>     messages: []
    [error] <0.969.0>     links: [<0.967.0>]
    [error] <0.969.0>     dictionary: [{'$logger_metadata$',#{domain => [rabbitmq,connection]}}]
    [error] <0.969.0>     trap_exit: true
    [error] <0.969.0>     status: running
    [error] <0.969.0>     heap_size: 46422
    [error] <0.969.0>     stack_size: 29
    [error] <0.969.0>     reductions: 5301495

[How]
Let's use a different cluster for each testcase. This was probably the
initial intention anyway.

Author: dumbbell

deps/rabbitmq_stream/test/rabbit_stream_partitions_SUITE.erl

@@ -54,21 +54,25 @@ init_per_suite(Config) ->
 end_per_suite(Config) ->
     Config.
 
-init_per_group(Group, Config) ->
+init_per_group(_Group, Config) ->
     Config1 = rabbit_ct_helpers:run_setup_steps(
                 Config,
                 [fun rabbit_ct_broker_helpers:configure_dist_proxy/1]),
     rabbit_ct_helpers:set_config(Config1,
-                                 [{rmq_nodename_suffix, Group},
-                                  {net_ticktime, ?NET_TICKTIME_S}]).
+                                 [{net_ticktime, ?NET_TICKTIME_S}]).
 end_per_group(_, Config) ->
     Config.
 
 init_per_testcase(TestCase, Config) ->
     Config1 = rabbit_ct_helpers:testcase_started(Config, TestCase),
+    ClusterSize = 3,
+    TestNumber = rabbit_ct_helpers:testcase_number(Config, ?MODULE, TestCase),
     Config2 = rabbit_ct_helpers:set_config(
-                Config1, [{rmq_nodes_clustered, true},
-                          {rmq_nodes_count, 3},
+                Config1, [{rmq_nodename_suffix, TestCase},
+                          {tcp_ports_base,
+                           {skip_n_nodes, TestNumber * ClusterSize}},
+                          {rmq_nodes_clustered, true},
+                          {rmq_nodes_count, ClusterSize},
                           {tcp_ports_base}
                          ]),
     rabbit_ct_helpers:run_setup_steps(