Display contributor badge on notes

This removes the feature flag, and so makes it enabled everywhere.

This was originally implemented in
https://gitlab.com/gitlab-org/gitlab/-/merge_requests/40198 and only
applies to the Contributor badge. The Author badge has a separate issue,
discussed in https://gitlab.com/gitlab-org/gitlab/-/issues/250282.

app/models/note.rb

@@ -322,8 +322,6 @@ class Note < ApplicationRecord
   end
 
   def contributor?
-    return false unless ::Feature.enabled?(:show_contributor_on_note, project)
-
     project&.team&.contributor?(self.author_id)
   end
 

changelogs/unreleased/display-contributor-and-author-badges-on-notes.yml

+---
+title: Display Contributor badges on notes
+merge_request: 42576
+author: Mycroft Kang @TaehyeokKang
+type: added

config/feature_flags/development/show_contributor_on_note.yml

----
-name: show_contributor_on_note
-introduced_by_url: https://gitlab.com/gitlab-org/gitlab/-/merge_requests/40198
-rollout_issue_url: https://gitlab.com/gitlab-org/gitlab/-/issues/249179
-group: group::project management
-type: development
-default_enabled: false
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