Issue Lifecycle: Prompt author for type label [Type label hygiene] [Iteration 1]

Summary

• Summary: Prompt author for type label
• Lifecycle stage: New issues
• Action type: Reactive

Proposal

Triage reactive asks the author for type label on issue creation when not present

• Receive webhook for new issue
• Check for type labels
• Ask author to apply correct label via reactive labeller
  • Link to or list available type labels
  • Note how to execute the correct action for triage reactive to apply label