Disable AbstractFolder when item gets unreferenced

[franknarf8]

Disables MultibranchWorkflow jobs and other folders when the type supports being disabled

Testing done

Manually using mvn hpi:run

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 demonstrate the feature works or the issue is fixed

https://issues.jenkins.io/browse/JENKINS-64058?focusedCommentId=435419&page=com.atlassian.jira.plugin.system.issuetabpanels%3Acomment-tabpanel