Remove legacy service for creating pipeline stages

app/services/ci/create_pipeline_stages_service.rb

-module Ci
-  class CreatePipelineStagesService < BaseService
-    def execute(pipeline)
-      pipeline.stage_seeds.each do |seed|
-        seed.user = current_user
-        seed.create!
-      end
-    end
-  end
-end

lib/gitlab/ci/pipeline/chain/create.rb

@@ -11,9 +11,10 @@ module Gitlab
 
               @command.seeds_block&.call(pipeline)
 
-              ::Ci::CreatePipelineStagesService
-                .new(project, current_user)
-                .execute(pipeline)
+              pipeline.stage_seeds.each do |seed|
+                seed.user = current_user
+                seed.to_resource.save!
+              end
 
               # TODO populate environments with find_or_initialize_by in the chain too.
 

lib/gitlab/ci/pipeline/seed/base.rb

@@ -7,7 +7,7 @@ module Gitlab
             raise NotImplementedError
           end
 
-          def excluded?
+          def included?
             raise NotImplementedError
           end
 

lib/gitlab/ci/pipeline/seed/stage.rb

@@ -31,11 +31,7 @@ module Gitlab
           end
 
           def to_resource
-            ::Ci::Stage.new(attributes)
-          end
-
-          def create!
-            to_resource.tap do |stage|
+            ::Ci::Stage.new(attributes).tap do |stage|
               @seeds.each do |seed|
                 seed.to_resource.tap do |build|
                   stage.builds << build
@@ -43,8 +39,6 @@ module Gitlab
               end
 
               @pipeline.stages << stage
-
-              stage.save!
             end
           end
         end

spec/lib/gitlab/ci/pipeline/seed/stage_spec.rb

@@ -65,9 +65,9 @@ describe Gitlab::Ci::Pipeline::Seed::Stage do
     end
   end
 
-  describe '#create!' do
-    it 'creates all stages and builds' do
-      subject.create!
+  describe '#to_resource' do
+    it 'builds a valid stage object with all builds' do
+      subject.to_resource.save!
 
       expect(pipeline.reload.stages.count).to eq 1
       expect(pipeline.reload.builds.count).to eq 2