Require ee validator file explicitely

- During local development on osx with gdk, it was noticed
  that autoloader didn't define the ee version of the file
  at the load time of the non ee file and therefore
  caused an uninitialized constant error.

ee/lib/ee/api/validations.rb

+# frozen_string_literal: true
+
+module EE
+  module API
+    module Validations
+      # This empty module is needed to resolve Mac OS X flakey autoloading issues as seen in
+      # https://gitlab.com/gitlab-org/gitlab/-/merge_requests/28804
+    end
+  end
+end