DRY lib/event_filter.rb for issue events
What does this MR do and why?
Use a scope in the Event model to DRY up the code in lib/event_filter.rb
MR acceptance checklist
This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.
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I have evaluated the MR acceptance checklist for this MR.
Related to #378944 (closed)