Merge branch 'improve-project-external-issue-trackers' into 'master'
Greatly improve external_issue_tracker performance See 3d41133d48f6522b8755bb91b804864e8e520871 for all the details. As an aside, this commit contains a set of migrations that will introduce downtime as they add a column with a default value which in turn locks the entire table (at least on PostgreSQL). See merge request !2498
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