Improve merged branch deletion efficiency

Vasilii Iakliushinrequested to merge
635885-delete-merged-branches-efficiency into master

Contributes to https://gitlab.com/gitlab-org/gitlab/-/work_items/635885

Problem

When projects have no merged branches, deletion still queries open merge requests. Repeated jobs can also queue redundant work, and a deleted requester causes retries.

Solution

  • Skip the two open merge request queries when there are no merged branches.
  • Deduplicate pending jobs and return when the requesting user no longer exists.
Edited by Vasilii Iakliushin

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