Use lazy queue in dynamic_ha_SUITE

In mixed version cluster tests where the new node
uses CQv2, when mirror synchronisation happens,
v2 (source) overloads v1 (destination) leading to
a memory spike and a crash (in a memory-constrained
CI environment). Given that in 3.12 we switch to
a lazy-like mode for all classic queues, I think
we can make use a lazy queue in the test.

Author: mkuratczyk

deps/rabbit/test/dynamic_ha_SUITE.erl

@@ -1018,16 +1018,16 @@ apply_policy(Config, N, undefined) ->
 apply_policy(Config, N, all) ->
     rabbit_ct_broker_helpers:set_ha_policy(
       Config, N, ?POLICY, <<"all">>,
-      [{<<"ha-sync-mode">>, <<"automatic">>}]);
+      [{<<"ha-sync-mode">>, <<"automatic">>}, {<<"queue-mode">>, <<"lazy">>}]);
 apply_policy(Config, N, {nodes, Nodes}) ->
     NNodes = [atom_to_binary(Node) || Node <- Nodes],
     rabbit_ct_broker_helpers:set_ha_policy(
       Config, N, ?POLICY, {<<"nodes">>, NNodes},
-      [{<<"ha-sync-mode">>, <<"automatic">>}]);
+      [{<<"ha-sync-mode">>, <<"automatic">>}, {<<"queue-mode">>, <<"lazy">>}]);
 apply_policy(Config, N, {exactly, Exactly}) ->
     rabbit_ct_broker_helpers:set_ha_policy(
       Config, N, ?POLICY, {<<"exactly">>, Exactly},
-      [{<<"ha-sync-mode">>, <<"automatic">>}]).
+      [{<<"ha-sync-mode">>, <<"automatic">>}, {<<"queue-mode">>, <<"lazy">>}]).
 
 forget_cluster_node(Config, Node, NodeToRemove) ->
     rabbit_ct_broker_helpers:rabbitmqctl(