Add the "type label nudger" processor

Context

Relates to #988 (closed)

What's in this MR?

• The Type Label Nudger processor that will:
  • Create a discussion if no work type labels are present (or unresolve it if the discussion has been created previously)
  • Resolve a previously created discussion if work type labels are found on the MR
• A background job to actually create a discussion 5 minutes after we found the unclassified merge request.
• 📚 Some documentation update on how to run triage-ops locally more effectively

What is looks like

Verify it locally

First test

• git checkout 988-add_type_label_nudger_processor
• Change the reaction time from 300 to 3
• Build/Run triage-ops locally with a local GitLab instance
• In an existing MR, Remove all work type labels
• A discussion should pop up in the MR, telling you to add a work type label.
• Add a work type label: the discussion should resolve itself

Second test

• git checkout 988-add_type_label_nudger_processor
• Change the reaction time from 300 to 20
• Build/Run triage-ops locally with a local GitLab instance
• In an existing MR, Remove all work type labels
• After 20 seconds, a discussion should pop up in the MR, telling you to add a work type label.
• Delete that discussion
• Delete any label from the MR, and add a work type label in the next 20 seconds: /label ~"type::bug"
  • No new discussion should pop up