single validator in use and ensure test uses node count arg

Author: Ayanda-D

deps/rabbitmq_cli/lib/rabbitmq/cli/queues/commands/grow_to_count_command.ex

@@ -56,12 +56,7 @@ defmodule RabbitMQ.CLI.Queues.Commands.GrowToCountCommand do
   end
 
   def validate_execution_environment(args, opts) do
-    Validators.chain(
-      [
-        &Validators.rabbit_is_running/2
-      ],
-      [args, opts]
-    )
+    Validators.rabbit_is_running(args, opts)
   end
 
   def run([node_count, strategy], %{

deps/rabbitmq_cli/test/queues/grow_to_count_command_test.exs

@@ -78,7 +78,7 @@ defmodule RabbitMQ.CLI.Queues.Commands.GrowToCountCommandTest do
   end
 
   test "validate: when wrong membership is provided, returns failure" do
-    assert @command.validate(["quorum-queue-a", "all"], %{membership: "banana"}) ==
+    assert @command.validate([7, "all"], %{membership: "banana"}) ==
              {:validation_failure, "voter status 'banana' is not recognised."}
   end