Merge branch 'licenses-app-disabled-default' into 'master'

Disable licenses_app feature flag

Closes #11534

See merge request gitlab-org/gitlab-ee!13291

ee/app/views/admin/licenses/show.html.haml

 - page_title "License"
 
-- if Feature.enabled?(:licenses_app, default_enabled: true)
+- if Feature.enabled?(:licenses_app)
   #instance-license-mount-element{ license_app_data }
 - else
   %h3.page-title

ee/changelogs/unreleased/licenses-app-disabled-default.yml

+---
+title: Disable licenses_app feature flag by default
+merge_request: 13291
+author:
+type: fixed