Add classification for overcommit

- noticed none existed

lib/gitlab/danger/helper.rb

@@ -131,6 +131,8 @@ module Gitlab
         %r{\Arubocop/cop/migration(/|\.rb)} => :database,
 
         %r{\A(\.gitlab-ci\.yml\z|\.gitlab\/ci)} => :engineering_productivity,
+        %r{\A\.overcommit\.yml\.example\z} => :engineering_productivity,
+        %r{\Atooling/overcommit/} => :engineering_productivity,
         %r{Dangerfile\z} => :engineering_productivity,
         %r{\A(ee/)?(danger/|lib/gitlab/danger/)} => :engineering_productivity,
         %r{\A(ee/)?scripts/} => :engineering_productivity,

spec/lib/gitlab/danger/helper_spec.rb

@@ -218,6 +218,8 @@ describe Gitlab::Danger::Helper do
       'scripts/foo'                                           | :engineering_productivity
       'lib/gitlab/danger/foo'                                 | :engineering_productivity
       'ee/lib/gitlab/danger/foo'                              | :engineering_productivity
+      '.overcommit.yml.example'                               | :engineering_productivity
+      'tooling/overcommit/foo'                                | :engineering_productivity
 
       'lib/gitlab/ci/templates/Security/SAST.gitlab-ci.yml'   | :backend