Use specialized worker to refresh authorizations on project transfer

With this change, we will be using a specialized
worker to refresh authorizations whenever a
project is transferred to a new namespace/group.

Changelog: performance

app/services/projects/transfer_service.rb

@@ -154,7 +154,6 @@ module Projects
       user_ids = @old_namespace.user_ids_for_project_authorizations |
         @new_namespace.user_ids_for_project_authorizations
 
-      if Feature.enabled?(:specialized_worker_for_project_transfer_auth_recalculation)
       AuthorizedProjectUpdate::ProjectRecalculateWorker.perform_async(project.id)
 
       # Until we compare the inconsistency rates of the new specialized worker and
@@ -164,9 +163,6 @@ module Projects
         blocking: false,
         priority: UserProjectAccessChangedService::LOW_PRIORITY
       )
-      else
-        UserProjectAccessChangedService.new(user_ids).execute
-      end
     end
 
     def rollback_side_effects

config/feature_flags/development/specialized_worker_for_project_transfer_auth_recalculation.yml

----
-name: specialized_worker_for_project_transfer_auth_recalculation
-introduced_by_url: https://gitlab.com/gitlab-org/gitlab/-/merge_requests/61967
-rollout_issue_url: https://gitlab.com/gitlab-org/gitlab/-/issues/334237
-milestone: '14.1'
-type: development
-group: group::access
-default_enabled: false

spec/services/projects/transfer_service_spec.rb

@@ -478,11 +478,6 @@ RSpec.describe Projects::TransferService do
       group.add_owner(user)
     end
 
-    context 'when the feature flag `specialized_worker_for_project_transfer_auth_recalculation` is enabled' do
-      before do
-        stub_feature_flags(specialized_worker_for_project_transfer_auth_recalculation: true)
-      end
-
     it 'calls AuthorizedProjectUpdate::ProjectRecalculateWorker to update project authorizations' do
       expect(AuthorizedProjectUpdate::ProjectRecalculateWorker)
         .to receive(:perform_async).with(project.id)
@@ -510,29 +505,6 @@ RSpec.describe Projects::TransferService do
     end
   end
 
-    context 'when the feature flag `specialized_worker_for_project_transfer_auth_recalculation` is disabled' do
-      before do
-        stub_feature_flags(specialized_worker_for_project_transfer_auth_recalculation: false)
-      end
-
-      it 'calls UserProjectAccessChangedService to update project authorizations' do
-        user_ids = [user.id, member_of_old_group.id, member_of_new_group.id]
-
-        expect_next_instance_of(UserProjectAccessChangedService, user_ids) do |service|
-          expect(service).to receive(:execute)
-        end
-
-        execute_transfer
-      end
-
-      it 'refreshes the permissions of the members of the old and new namespace' do
-        expect { execute_transfer }
-          .to change { member_of_old_group.authorized_projects.include?(project) }.from(true).to(false)
-          .and change { member_of_new_group.authorized_projects.include?(project) }.from(false).to(true)
-      end
-    end
-  end
-
   describe 'transferring a design repository' do
     subject { described_class.new(project, user) }