Merge branch 'ability-batch-issue-checking' into 'master'
Optimize checking if a user can read multiple issues ## What does this MR do? This optimizes various parts of the code so it can more efficiently check if a user can read a list of issues. ## Are there points in the code the reviewer needs to double check? Yes, in particular `Ability.issues_readable_by_user` should be checked to make sure it correctly allows/restricts access to issues. ## Why was this MR needed? Currently the general approach to checking if one can read an issue is to iterate over the issues to check and call `can?(user, :read_issue, issue)` for every issue. This is not efficient as the same work has to be done for every issue. ## What are the relevant issue numbers? * #15607 * #17463 See merge request !5370
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