Reuse authors when rendering event Atom feeds
What does this MR do?
This changes the code used for rendering events atom feeds so we don't execute N+1 queries just to get author Emails. See the commit message for more details.
Does this MR meet the acceptance criteria?
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Changelog entry added, if necessary - Review
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Has been reviewed by Backend -
Has been reviewed by Database
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Conform by the merge request performance guides -
Conform by the style guides -
Squashed related commits together -
Internationalization required/considered