Remove sync_namespace_name_with_cdot flag

Cleanup the sync_namespace_name_with_cdot
feature flag

Changelog: other

ee/app/models/ee/namespace.rb

@@ -471,7 +471,6 @@ module EE
     end
 
     def sync_name_with_customers_dot
-      return unless ::Feature.enabled?(:sync_namespace_name_with_cdot)
       return unless ::Gitlab.com?
 
       ::Namespaces::SyncNamespaceNameWorker.perform_async(id)

ee/config/feature_flags/development/sync_namespace_name_with_cdot.yml

----
-name: sync_namespace_name_with_cdot
-introduced_by_url: https://gitlab.com/gitlab-org/gitlab/-/merge_requests/69896
-rollout_issue_url: https://gitlab.com/gitlab-org/gitlab/-/issues/341056
-milestone: '14.3'
-type: development
-group: group::license
-default_enabled: false

ee/spec/models/ee/namespace_spec.rb

@@ -365,7 +365,6 @@ RSpec.describe Namespace do
     subject(:update_namespace) { namespace.update!(attributes) }
 
     before do
-      stub_feature_flags(sync_namespace_name_with_cdot: true)
       allow(Gitlab).to receive(:com?).and_return(true)
     end
 
@@ -386,14 +385,6 @@ RSpec.describe Namespace do
     context 'when the name is updated' do
       let(:attributes) { { name: 'Foo' } }
 
-      context 'with :sync_namespace_name_with_cdot feature flag disabled' do
-        before do
-          stub_feature_flags(sync_namespace_name_with_cdot: false)
-        end
-
-        include_examples 'no sync'
-      end
-
       context 'when not on Gitlab.com?' do
         before do
           allow(Gitlab).to receive(:com?).and_return(false)