Use only/except policy that returns an array

lib/gitlab/ci/config/entry/policy.rb

@@ -15,10 +15,6 @@ module Gitlab
             validations do
               validates :config, array_of_strings_or_regexps: true
             end
-
-            def value
-              { refs: @config }
-            end
           end
 
           class ExpressionsPolicy < Entry::Node

spec/lib/gitlab/ci/config/entry/policy_spec.rb

@@ -17,7 +17,7 @@ describe Gitlab::Ci::Config::Entry::Policy do
 
           describe '#value' do
             it 'returns key value' do
-              expect(entry.value).to eq(refs: config)
+              expect(entry.value).to eq config
             end
           end
         end