Enable gldropdown_tags feature flag

Changelog: changed

changelogs/unreleased/jivanvl-enable-gldropdown-tags-ff.yml

+---
+title: Improve dropdown and search in the tags page
+merge_request: 60145
+author:
+type: changed

config/feature_flags/development/gldropdown_tags.yml

@@ -5,4 +5,4 @@ rollout_issue_url: https://gitlab.com/gitlab-org/gitlab/-/issues/327055
 milestone: '13.11'
 type: development
 group: group::continuous integration
-default_enabled: false
+default_enabled: true