Added cron to prune events older than 12 months.
Since contribution calendar shows only 12 months of activity, events older than that time are not visible anywhere and can be safely pruned saving big amount of database storage.
They are now pruned everyday at midnight by Sidekiq cron worker.
Fixes #21164 (closed)
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CHANGELOG entry added -
Documentation created/updated -
API support added - Tests
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All builds are passing
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Conform by the merge request performance guides -
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Branch has no merge conflicts with master(if you do - rebase it please) -
Squashed related commits together