Remove cross_project_need_artifacts feature flag

ee/app/models/ee/ci/build.rb

@@ -122,7 +122,6 @@ module EE
       override :cross_dependencies
       def cross_dependencies
         return [] unless user_id
-        return [] unless ::Feature.enabled?(:cross_project_need_artifacts, project, default_enabled: true)
         return [] unless project.feature_available?(:cross_project_pipelines)
 
         cross_dependencies_relationship

ee/spec/models/ci/build_spec.rb

@@ -551,14 +551,6 @@ describe Ci::Build do
 
           it { is_expected.to be_empty }
         end
-
-        context 'when feature is disabled' do
-          before do
-            stub_feature_flags(cross_project_need_artifacts: false)
-          end
-
-          it { is_expected.to be_empty }
-        end
       end
 
       context 'without permissions to other_project' do