text: Title: Allow `display_skipped_hosts` to be configured via vars
  Body: ### Summary
  
  Allow callback plugins to be dynamically configured via vars, specifically in this case, allow `display_skipped_hosts` to be configured dynamically
  
  ### Issue Type
  
  Feature Idea
  
  ### Component Name
  
  lib/ansible/plugins/callback/default.py
  
  ### Additional Information
  
  <!--- Paste example playbooks or commands between quotes below -->
  ```yaml (paste below)
  
  ```
  
  
  ### Code of Conduct
  
  - [X] I agree to follow the Ansible Code of Conduct