fix test button functionality for project -> service -> gitlab ci

app/controllers/services_controller.rb

@@ -26,8 +26,7 @@ class ServicesController < ProjectResourceController
   end
   def test
-    commits = project.repository.commits(project.default_branch, nil, 3)
-    data = project.post_receive_data(commits.last.id, commits.first.id, "refs/heads/#{project.default_branch}", current_user)
+    data = GitPushService.new.sample_data(project, current_user)
     @service = project.gitlab_ci_service
     @service.execute(data)