Do not revert to refinement when missing type

What does this MR do and why?

Iterate on the implementation for Add issues with workflow::ready for development... (#994 - closed).

Instead of moving issues without a ~type:: label back to workflowrefinement, the processor now tags the actor and asks them to update the type.

I've made this change because the initial MR received feedback that changing the workflow was unnecessarily disruptive.

Expected impact & dry-runs

The applicable? filter hasn't been changed.

The process action changed:

• FROM
  • tag author; notify of the workflow change
  • add workflowrefinement
• TO
  • tag author; request to update the type label

Action items

• If adding environment variables for reactive processors, update config/triage-web.yaml and .gitlab/ci/triage-web.yml
• (If applicable) Add documentation to the handbook pages for Triage Operations =>
• (If applicable) Identify the affected groups and how to communicate to them:
  • /cc @person_or_group =>
  • Relevant Slack channels =>
  • Engineering week-in-review