Enable the `ci_release_generation` feature flag by default

Part of https://gitlab.com/gitlab-org/gitlab/-/issues/222594

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/34633

changelogs/unreleased/222594-enable-the-release_asset_link_type-feature-flag-by-default.yml

+---
+title: Enable `:ci_release_generation` feature flag by default
+merge_request: 34633
+author:
+type: changed

lib/gitlab/ci/features.rb

@@ -39,7 +39,7 @@ module Gitlab
       end
 
       def self.release_generation_enabled?
-        ::Feature.enabled?(:ci_release_generation)
+        ::Feature.enabled?(:ci_release_generation, default_enabled: true)
       end
 
       # Remove in https://gitlab.com/gitlab-org/gitlab/-/issues/224199