Merge branch 'ee-add-feature-check-for-file-lock' into 'master'

Add feature check to Lock button

Closes #5952

See merge request gitlab-org/gitlab-ee!5656

ee/app/helpers/ee/lock_helper.rb

 module EE
   module LockHelper
     def lock_file_link(project = @project, path = @path, html_options: {})
+      return unless project.feature_available?(:file_locks)
       return unless current_user
       return if path.blank?
 

ee/changelogs/unreleased/ee-add-feature-check-for-file-lock.yml

+---
+title: Hide Lock button if File Locking feature is not available in license
+merge_request: 5656
+author:
+type: fixed
\ No newline at end of file