<!-- Title suggestion: [Feature flag] Cleanup use_built_in_project_templates_enabled --> ## Summary This issue is to cleanup the `use_built_in_project_templates_enabled` feature flag, after the feature flag has been enabled by default for an appropriate amount of time in production. At this point, we can also remove the `experiment` label from the GraphQL argument exposed in https://gitlab.com/gitlab-org/gitlab/-/work_items/593620+ <!-- Short description of what the feature is about and link to relevant other issues. Ensure to note if the feature will be removed completely or will be productized--> ## Owners - Team: NAME_OF_TEAM - Most appropriate slack channel to reach out to: `#g_create_source-code` - Best individual to reach out to: NAME - PM: NAME ## Stakeholders <!-- Are there any other stages or teams involved that need to be kept in the loop? - Name of a PM - The Support Team - The Delivery Team --> ## Expectations ### What might happen if this goes wrong? <!-- Any MRs that need to be rolled back? Communication that needs to happen? What are some things you can think of that could go wrong - data loss or broken pages? --> ### Cleaning up the feature flag <!-- The checklist here is to help stakeholders keep track of the feature flag status --> - [ ] Specify in the issue description if this feature will be removed completely or will be productized as part of the Feature Flag cleanup - [ ] Verify that external API consumers (e.g., IDE extensions, CLI tools) that may check this feature flag have been updated or can gracefully handle its removal. - [ ] Create a merge request to remove `use_built_in_project_templates_enabled` feature flag. Ask for review and merge it. - [ ] Remove all references to the feature flag from the codebase. - [ ] Remove the YAML definitions for the feature from the repository. - [ ] Create [a changelog entry](https://docs.gitlab.com/development/feature_flags/#changelog). - [ ] Ensure that the cleanup MR has been deployed to both production and canary. If the merge request was deployed before [the code cutoff](https://about.gitlab.com/handbook/engineering/releases/#self-managed-releases-1), the feature can be officially announced in a release blog post. - [ ] `/chatops run auto_deploy status <merge-commit-of-cleanup-mr>` - [ ] Close [the feature issue](ISSUE LINK) to indicate the feature will be released in the current milestone. - [ ] If not already done, clean up the feature flag from all environments by running these chatops command in `#production` channel: `/chatops run feature delete use_built_in_project_templates_enabled --dev --pre --staging --staging-ref --production` - [ ] Close [the rollout issue](ISSUE LINK). <!-- Uncomment the appropriate type label /label ~"type::feature" ~"feature::addition" /label ~"type::maintenance" /label ~"type::bug" -->