Transition to scoped feature/tooling labels

This is a preparatory step before we deprecate and move away from the
`backstage` label.

Next step will be removing references to `backstage`:
https://gitlab.com/gitlab-org/gitlab/-/issues/219751

See
https://gitlab.com/gitlab-org/quality/team-tasks/-/issues/488#proposal
for the overall plan.
Signed-off-by: Rémy Coutable <remy@rymai.me>

danger/metadata/Dangerfile

@@ -4,8 +4,13 @@ THROUGHPUT_LABELS = [
   'Community contribution',
   'security',
   'bug',
+  'backstage', # To be removed by https://gitlab.com/gitlab-org/gitlab/-/issues/222360.
   'feature',
-  'backstage',
+  'feature::addition',
+  'feature::maintenance',
+  'tooling',
+  'tooling::pipelines',
+  'tooling::workflow',
   'documentation'
 ].freeze
 

danger/specs/Dangerfile

 # frozen_string_literal: true
 
-NO_SPECS_LABELS = %w[backstage documentation QA].freeze
+NO_SPECS_LABELS = [
+  'backstage', # To be removed by https://gitlab.com/gitlab-org/gitlab/-/issues/222360.
+  'tooling',
+  'tooling::pipelines',
+  'tooling::workflow',
+  'documentation',
+  'QA'
+].freeze
 NO_NEW_SPEC_MESSAGE = <<~MSG
 You've made some app changes, but didn't add any tests.
 That's OK as long as you're refactoring existing code,

lib/gitlab/danger/changelog.rb

@@ -3,7 +3,14 @@
 module Gitlab
   module Danger
     module Changelog
-      NO_CHANGELOG_LABELS = %w[backstage ci-build meta].freeze
+      NO_CHANGELOG_LABELS = [
+        'backstage', # To be removed by https://gitlab.com/gitlab-org/gitlab/-/issues/222360.
+        'tooling',
+        'tooling::pipelines',
+        'tooling::workflow',
+        'ci-build',
+        'meta'
+      ].freeze
       NO_CHANGELOG_CATEGORIES = %i[docs none].freeze
 
       def needed?