Rename CI config hidden job entry to hidden entry

lib/gitlab/ci/config/node/hidden.rb

@@ -5,7 +5,7 @@ module Gitlab
         ##
         # Entry that represents a hidden CI/CD job.
         #
-        class HiddenJob < Entry
+        class Hidden < Entry
           include Validatable
 
           validations do

lib/gitlab/ci/config/node/jobs.rb

@@ -30,7 +30,7 @@ module Gitlab
 
           def compose!
             @config.each do |name, config|
-              node = hidden?(name) ? Node::HiddenJob : Node::Job
+              node = hidden?(name) ? Node::Hidden : Node::Job
 
               factory = Node::Factory.new(node)
                 .value(config || {})

spec/lib/gitlab/ci/config/node/hidden_spec.rb

@@ -1,6 +1,6 @@
 require 'spec_helper'
 
-describe Gitlab::Ci::Config::Node::HiddenJob do
+describe Gitlab::Ci::Config::Node::Hidden do
   let(:entry) { described_class.new(config) }
 
   describe 'validations' do

spec/lib/gitlab/ci/config/node/jobs_spec.rb

@@ -74,7 +74,7 @@ describe Gitlab::Ci::Config::Node::Jobs do
         expect(entry.descendants.first(2))
           .to all(be_an_instance_of(Gitlab::Ci::Config::Node::Job))
         expect(entry.descendants.last)
-          .to be_an_instance_of(Gitlab::Ci::Config::Node::HiddenJob)
+          .to be_an_instance_of(Gitlab::Ci::Config::Node::Hidden)
       end
     end