Add suggest pipeline parameter for ci config path

- we need this to trigger the continuation of the suggest
  pipeline tour on downstream pages.

app/serializers/merge_request_widget_entity.rb

@@ -55,7 +55,8 @@ class MergeRequestWidgetEntity < Grape::Entity
       merge_request.source_project,
       merge_request.source_branch,
       file_name: '.gitlab-ci.yml',
-      commit_message: s_("CommitMessage|Add %{file_name}") % { file_name: Gitlab::FileDetector::PATTERNS[:gitlab_ci] }
+      commit_message: s_("CommitMessage|Add %{file_name}") % { file_name: Gitlab::FileDetector::PATTERNS[:gitlab_ci] },
+      suggest_gitlab_ci_yml: true
     )
   end
 

spec/serializers/merge_request_widget_entity_spec.rb

@@ -75,8 +75,9 @@ describe MergeRequestWidgetEntity do
         let(:role) { :developer }
 
         it 'has add ci config path' do
-          expect(subject[:merge_request_add_ci_config_path])
-            .to eq("/#{resource.project.full_path}/-/new/#{resource.source_branch}?commit_message=Add+.gitlab-ci.yml&file_name=.gitlab-ci.yml")
+          expected_path = "/#{resource.project.full_path}/-/new/#{resource.source_branch}?commit_message=Add+.gitlab-ci.yml&file_name=.gitlab-ci.yml&suggest_gitlab_ci_yml=true"
+
+          expect(subject[:merge_request_add_ci_config_path]).to eq(expected_path)
         end
 
         context 'when source project is missing' do