Serializing web_based_commit_signing_enabled leads to N+1 queries

• web_based_commit_signing_enabled is a cascading setting (see: https://docs.gitlab.com/development/cascading_settings/)
  • This means that ancestor values (groups) are considered when trying to read this value from the project
    • This leads to N+1 queries when the value is serialized for multiple projects (e.g in a graphql query)