rabbitmq-server: move to by-name hierarchy

Author: samueltardieu

pkgs/servers/amqp/rabbitmq-server/default.nix renamed to pkgs/by-name/ra/rabbitmq-server/package.nix

@@ -12177,7 +12177,7 @@ with pkgs;
 
   qremotecontrol-server = libsForQt5.callPackage ../servers/misc/qremotecontrol-server { };
 
-  rabbitmq-server = callPackage ../servers/amqp/rabbitmq-server rec {
+  rabbitmq-server = callPackage ../by-name/ra/rabbitmq-server/package.nix rec {
     erlang = erlang_27;
     elixir = pkgs.elixir.override { inherit erlang; };
   };