Merge branch '233551-remove-devise-unknown-formats-ff' into 'master'

Remove devise_redirect_unknown_formats feature flag

Closes #233551

See merge request gitlab-org/gitlab!38657

lib/gitlab/devise_failure.rb

@@ -7,8 +7,6 @@ module Gitlab
     # If the request format is not known, send a redirect instead of a 401
     # response, since this is the outcome we're most likely to want
     def http_auth?
-      return super unless Feature.enabled?(:devise_redirect_unknown_formats, default_enabled: true)
-
       request_format && super
     end
 

spec/controllers/application_controller_spec.rb

@@ -190,21 +190,11 @@ RSpec.describe ApplicationController do
       expect(response).to redirect_to new_user_session_path
     end
 
-    context 'request format is unknown' do
-      it 'redirects if unauthenticated' do
+    it 'redirects if unauthenticated and request format is unknown' do
       get :index, format: 'unknown'
 
       expect(response).to redirect_to new_user_session_path
     end
-
-      it 'returns a 401 if the feature flag is disabled' do
-        stub_feature_flags(devise_redirect_unknown_formats: false)
-
-        get :index, format: 'unknown'
-
-        expect(response).to have_gitlab_http_status(:unauthorized)
-      end
-    end
   end
 
   describe '#set_page_title_header' do