Remove destroy_user_associations_in_batches flag

Make the change available for everyone

app/services/users/destroy_service.rb

@@ -56,12 +56,10 @@ module Users
 
       MigrateToGhostUserService.new(user).execute unless options[:hard_delete]
 
-      if Feature.enabled?(:destroy_user_associations_in_batches)
       # Rails attempts to load all related records into memory before
       # destroying: https://github.com/rails/rails/issues/22510
       # This ensures we delete records in batches.
       user.destroy_dependent_associations_in_batches
-      end
 
       # Destroy the namespace after destroying the user since certain methods may depend on the namespace existing
       user_data = user.destroy

spec/services/users/destroy_service_spec.rb

@@ -26,16 +26,6 @@ describe Users::DestroyService do
         service.execute(user)
       end
 
-      context 'when :destroy_user_associations_in_batches flag is disabled' do
-        it 'does not delete user associations in batches' do
-          stub_feature_flags(destroy_user_associations_in_batches: false)
-
-          expect(user).not_to receive(:destroy_dependent_associations_in_batches)
-
-          service.execute(user)
-        end
-      end
-
       it 'will delete the project' do
         expect_next_instance_of(Projects::DestroyService) do |destroy_service|
           expect(destroy_service).to receive(:execute).once.and_return(true)