Enable api_fuzzing_configuration_ui by default

ee/changelogs/unreleased/299465-default-enable-api-fuzzing-configuration-ui-ff.yml

+---
+title: Add a form to generate API Fuzzing configuration YAML snippets
+merge_request: 56548
+author:
+type: added

ee/config/feature_flags/development/api_fuzzing_configuration_ui.yml

@@ -5,4 +5,4 @@ rollout_issue_url: https://gitlab.com/gitlab-org/gitlab/-/issues/299234
 milestone: '13.9'
 type: development
 group: group::fuzz testing
-default_enabled: false
+default_enabled: true