Remove unused expressions policy from ci/cd config

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

@@ -7,7 +7,6 @@ module Gitlab
         #
         class Policy < Simplifiable
           strategy :RefsPolicy, if: -> (config) { config.is_a?(Array) }
-          strategy :ExpressionsPolicy, if: -> (config) { config.is_a?(Hash) }
 
           class RefsPolicy < Entry::Node
             include Entry::Validatable
@@ -17,24 +16,6 @@ module Gitlab
             end
           end
 
-          class ExpressionsPolicy < Entry::Node
-            include Entry::Validatable
-            include Entry::Attributable
-
-            attributes :refs, :expressions
-
-            validations do
-              validates :config, presence: true
-              validates :config, allowed_keys: %i[refs expressions]
-
-              with_options allow_nil: true do
-                validates :refs, array_of_strings_or_regexps: true
-                validates :expressions, type: Array
-                validates :expressions, presence: true
-              end
-            end
-          end
-
           class UnknownStrategy < Entry::Node
             def errors
               ["#{location} has to be either an array of conditions or a hash"]

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

@@ -56,26 +56,6 @@ describe Gitlab::Ci::Config::Entry::Policy do
     end
   end
 
-  context 'when using complex policy' do
-    context 'when it is an empty hash' do
-      let(:config) { {} }
-
-      it 'reports an error about configuration not being present' do
-        expect(entry.errors).to include /can't be blank/
-      end
-    end
-
-    context 'when it contains unknown keys' do
-      let(:config) { { refs: ['something'], invalid: 'master' } }
-
-      it 'is not valid entry' do
-        expect(entry).not_to be_valid
-        expect(entry.errors)
-          .to include /policy config contains unknown keys: invalid/
-      end
-    end
-  end
-
   context 'when policy strategy does not match' do
     let(:config) { 'string strategy' }