Merge branch 'ignore-epic-health-status' into 'master'

Ignore health_status column on epics

See merge request gitlab-org/gitlab!26763

app/models/epic.rb

@@ -5,6 +5,8 @@
 class Epic < ApplicationRecord
   include IgnorableColumns
 
+  ignore_column :health_status, remove_with: '13.0', remove_after: '2019-05-22'
+
   def self.link_reference_pattern
     nil
   end