Be more defensive when determining if a policy has CMQ keys

References #11192.

(cherry picked from commit b9e015c)

Author: michaelklishin

deps/rabbit/src/rabbit_mirror_queue_misc.erl

@@ -1010,7 +1010,9 @@ has_ha_policies(Policies) ->
               does_policy_configure_cmq(KeyList)
       end, Policies).
 
-does_policy_configure_cmq(KeyList) ->
+does_policy_configure_cmq(Map) when is_map(Map) ->
+    lists:keymember(<<"ha-mode">>, 1, rabbit_data_coercion:to_proplist(Map));
+does_policy_configure_cmq(KeyList) when is_list(KeyList) ->
     lists:keymember(<<"ha-mode">>, 1, KeyList).
 
 list_policies_with_classic_queue_mirroring_for_cli() ->