### Problem Custom project template export was accidentally added to import sources, which allowed admins to enable it as an import source. {width=944 height=287} As a result, `import_sources` column in `application_settings` table can include `gitlab_custom_project_template` value. ### Proposal 1. Create a migration to remove `gitlab_custom_project_template` values from `import_sources` in the `application_settings` table 2. Adjust validation to prevent `gitlab_custom_project_template` from being added as an import source