Merge branch 'check-flag-for-occurrence-state' into 'master'

Check feature flag when deciding occurrence state

See merge request gitlab-org/gitlab!22791

ee/app/models/vulnerabilities/occurrence.rb

@@ -136,6 +136,7 @@ module Vulnerabilities
 
     def state
       return 'dismissed' if dismissal_feedback.present?
+      return 'opened' unless Feature.enabled?(:first_class_vulnerabilities, project)
 
       if vulnerability.nil?
         'opened'