Add better way to load EE specific pipelines for Bulk Imports

- Remove Gitlab.ee? check in favour of `prepend_if_ee` syntax
  for EE specific Bulk Import `EpicsPipeline`

ee/lib/bulk_imports/ee/groups/graphql/get_epics_query.rb → ee/lib/ee/bulk_imports/groups/graphql/get_epics_query.rb

 # frozen_string_literal: true
 
-module BulkImports
-  module EE
+module EE
+  module BulkImports
     module Groups
       module Graphql
         module GetEpicsQuery

ee/lib/bulk_imports/ee/groups/loaders/epics_loader.rb → ee/lib/ee/bulk_imports/groups/loaders/epics_loader.rb

 # frozen_string_literal: true
 
-module BulkImports
-  module EE
+module EE
+  module BulkImports
     module Groups
       module Loaders
         class EpicsLoader

ee/lib/bulk_imports/ee/groups/pipelines/epics_pipeline.rb → ee/lib/ee/bulk_imports/groups/pipelines/epics_pipeline.rb

 # frozen_string_literal: true
 
-module BulkImports
-  module EE
+module EE
+  module BulkImports
     module Groups
       module Pipelines
         class EpicsPipeline
           include ::BulkImports::Pipeline
 
           extractor ::BulkImports::Common::Extractors::GraphqlExtractor,
-            query: BulkImports::EE::Groups::Graphql::GetEpicsQuery
+            query: EE::BulkImports::Groups::Graphql::GetEpicsQuery
 
-          transformer ::BulkImports::Common::Transformers::HashKeyDigger,
-            key_path: %w[data group epics]
+          transformer ::BulkImports::Common::Transformers::HashKeyDigger, key_path: %w[data group epics]
           transformer ::BulkImports::Common::Transformers::UnderscorifyKeysTransformer
           transformer ::BulkImports::Common::Transformers::ProhibitedAttributesTransformer
 
-          loader BulkImports::EE::Groups::Loaders::EpicsLoader
+          loader EE::BulkImports::Groups::Loaders::EpicsLoader
 
           after_run do |context|
             if context.entity.has_next_page?(:epics)

ee/lib/ee/bulk_imports/importers/group_importer.rb

+# frozen_string_literal: true
+
+module EE
+  module BulkImports
+    module Importers
+      module GroupImporter
+        extend ::Gitlab::Utils::Override
+
+        private
+
+        override :pipelines
+        def pipelines
+          super << EE::BulkImports::Groups::Pipelines::EpicsPipeline
+        end
+      end
+    end
+  end
+end

ee/spec/lib/bulk_imports/ee/groups/loaders/epics_loader_spec.rb → ee/spec/lib/ee/bulk_imports/groups/loaders/epics_loader_spec.rb

@@ -2,7 +2,7 @@
 
 require 'spec_helper'
 
-RSpec.describe BulkImports::EE::Groups::Loaders::EpicsLoader do
+RSpec.describe EE::BulkImports::Groups::Loaders::EpicsLoader do
   describe '#load' do
     let(:user) { create(:user) }
     let(:group) { create(:group) }

ee/spec/lib/bulk_imports/ee/groups/pipelines/epics_pipeline_spec.rb → ee/spec/lib/ee/bulk_imports/groups/pipelines/epics_pipeline_spec.rb

@@ -2,7 +2,7 @@
 
 require 'spec_helper'
 
-RSpec.describe BulkImports::EE::Groups::Pipelines::EpicsPipeline do
+RSpec.describe EE::BulkImports::Groups::Pipelines::EpicsPipeline do
   describe '#run' do
     let(:user) { create(:user) }
     let(:group) { create(:group) }
@@ -51,7 +51,7 @@ RSpec.describe BulkImports::EE::Groups::Pipelines::EpicsPipeline do
           {
             klass: BulkImports::Common::Extractors::GraphqlExtractor,
             options: {
-              query: BulkImports::EE::Groups::Graphql::GetEpicsQuery
+              query: EE::BulkImports::Groups::Graphql::GetEpicsQuery
             }
           }
         )
@@ -68,7 +68,7 @@ RSpec.describe BulkImports::EE::Groups::Pipelines::EpicsPipeline do
 
     it 'has loaders' do
       expect(described_class.loaders).to contain_exactly({
-        klass: BulkImports::EE::Groups::Loaders::EpicsLoader, options: nil
+        klass: EE::BulkImports::Groups::Loaders::EpicsLoader, options: nil
       })
     end
   end

ee/spec/lib/bulk_imports/importers/group_importer_spec.rb → ee/spec/lib/ee/bulk_imports/importers/group_importer_spec.rb

@@ -23,9 +23,9 @@ RSpec.describe BulkImports::Importers::GroupImporter do
 
   describe '#execute' do
     it "starts the entity and run its pipelines" do
-      expect(bulk_import_entity).to receive(:start).and_call_original
+      expect(bulk_import_entity).to receive(:start!).and_call_original
       expect_to_run_pipeline BulkImports::Groups::Pipelines::GroupPipeline, context: context
-      expect_to_run_pipeline BulkImports::EE::Groups::Pipelines::EpicsPipeline, context: context
+      expect_to_run_pipeline EE::BulkImports::Groups::Pipelines::EpicsPipeline, context: context
       expect_to_run_pipeline BulkImports::Groups::Pipelines::SubgroupEntitiesPipeline, context: context
 
       subject.execute

lib/bulk_imports/importers/group_importer.rb

@@ -18,9 +18,7 @@ module BulkImports
           configuration: configuration
         )
 
-        BulkImports::Groups::Pipelines::GroupPipeline.new.run(context)
-        'BulkImports::EE::Groups::Pipelines::EpicsPipeline'.constantize.new.run(context) if Gitlab.ee?
-        BulkImports::Groups::Pipelines::SubgroupEntitiesPipeline.new.run(context)
+        pipelines.each { |pipeline| pipeline.new.run(context) }
 
         entity.finish!
       end
@@ -28,6 +26,15 @@ module BulkImports
       private
 
       attr_reader :entity
+
+      def pipelines
+        [
+          BulkImports::Groups::Pipelines::GroupPipeline,
+          BulkImports::Groups::Pipelines::SubgroupEntitiesPipeline
+        ]
+      end
     end
   end
 end
+
+BulkImports::Importers::GroupImporter.prepend_if_ee('EE::BulkImports::Importers::GroupImporter')

spec/lib/bulk_imports/importers/group_importer_spec.rb

@@ -18,14 +18,14 @@ RSpec.describe BulkImports::Importers::GroupImporter do
   subject { described_class.new(bulk_import_entity) }
 
   before do
-    allow(Gitlab).to receive(:ee?).and_return(false)
     allow(BulkImports::Pipeline::Context).to receive(:new).and_return(context)
   end
 
   describe '#execute' do
     it 'starts the entity and run its pipelines' do
-      expect(bulk_import_entity).to receive(:start).and_call_original
+      expect(bulk_import_entity).to receive(:start!).and_call_original
       expect_to_run_pipeline BulkImports::Groups::Pipelines::GroupPipeline, context: context
+      expect_to_run_pipeline('EE::BulkImports::Groups::Pipelines::EpicsPipeline'.constantize, context: context) if Gitlab.ee?
       expect_to_run_pipeline BulkImports::Groups::Pipelines::SubgroupEntitiesPipeline, context: context
 
       subject.execute