Do not force mix format check as part of build

It makes joint 1.14/1.15 elixir compatibility too impractical

the format check is still performed in ci by bazel

(cherry picked from commit d563992)
(cherry picked from commit 328d6e6)

Author: HoloRin

deps/rabbitmq_cli/mix.exs

@@ -210,21 +210,18 @@ defmodule RabbitMQCtl.MixfileBase do
         "deps.compile"
       ],
       make_app: [
-        "format --check-formatted",
         "compile",
         "escript.build"
       ],
       make_all: [
         "deps.get",
         "deps.compile",
-        "format --check-formatted",
         "compile",
         "escript.build"
       ],
       make_all_in_src_archive: [
         "deps.get --only prod",
         "deps.compile",
-        "format --check-formatted",
         "compile",
         "escript.build"
       ]