browser_ui/4_verify/pipeline/run_pipeline_via_web_only_spec.rb | Verify Run pipeline with web only rule can trigger pipeline

In response to #230929

Steps

1. Log into GitLab
2. Create new project and setup runner
3. Add yml file with rule only: web to project
4. Go to pipeline page
5. No pipeline should be started yet
6. Click Run Pipeline button on page
7. Pipeline triggered and succeeds.