Introduce core status for blocked manual actions

lib/gitlab/ci/status/manual.rb → lib/gitlab/ci/status/blocked.rb

 module Gitlab
   module Ci
     module Status
-      class Manual < Status::Core
+      class Blocked < Status::Core
         def text
-          'manual'
+          'blocked'
         end
 
         def label
-          'manual'
+          'blocked action'
         end
 
         def icon