Remove dead code from ResourceMilestoneEvent model

eukorequested to merge
remove-dead-code-from-resource-milestone-event into master

What does this MR do and why?

The following columns appear to have been dropped. IgnorableColumns should be removed from ResourceMilestoneEvent.

  • reference
  • reference_html
  • cached_markdown_version

MR acceptance checklist

This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.

Edited by euko

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