See JENKINS-72788.

Testing done

After un-inlining the inline javascript in GitHubPushTrigger/config.groovy, it still can periodically send request to the "checkHookRegistered" endpoint.

Submitter checklist

• Make sure you are opening from a topic/feature/bugfix branch (right side) and not your main branch!
• Ensure that the pull request title represents the desired changelog entry
• Please describe what you did
• Link to relevant issues in GitHub or Jira
• Link to relevant pull requests, esp. upstream and downstream changes
• Ensure you have provided tests - that demonstrates feature works or fixes the issue