There are a couple of outdated dropdowns which are used to select refs (branches, tags and/or commits). These can be migrated to the existing [ref_selector Vue component](https://gitlab.com/gitlab-org/gitlab/-/blob/master/app/assets/javascripts/ref/components/ref_selector.vue). The estimated effort for these migrations is "medium" (one Engineering day), as they likely involve updating rspec tests as well. For an example MR that migrated an outdated dropdown to the ref_selector component, have a look at this community contribution: https://gitlab.com/gitlab-org/gitlab/-/merge_requests/81476