Move Gitlab::Auth.Result to separate file

lib/gitlab/auth.rb

 module Gitlab
   module Auth
-    Result = Struct.new(:actor, :project, :type, :authentication_abilities) do
-      def ci?
-        type == :ci
-      end
-
-      def lfs_deploy_token?
-        type == :lfs_deploy_token
-      end
-
-      def success?
-        actor.present? || type == :ci
-      end
-    end
-
     class MissingPersonalTokenError < StandardError; end
 
     class << self

lib/gitlab/auth/result.rb

+module Gitlab
+  module Auth
+    Result = Struct.new(:actor, :project, :type, :authentication_abilities) do
+      def ci?
+        type == :ci
+      end
+
+      def lfs_deploy_token?
+        type == :lfs_deploy_token
+      end
+
+      def success?
+        actor.present? || type == :ci
+      end
+    end
+  end
+end