Move debugging troubleshooting to new page
What does this MR do and why?
Move the Troubleshooting section out of the Debugging CI/CD pipelines page and create a new child page.
According to the Troubleshooting topic type, if a page has five or more troubleshooting topics, put those topics on a separate page.
Once this MR is merged
Once this MR is approved and merged, I'll create another MR to add a navigation item.
Related issue: #431954