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Use Redis cache for branch existence checks

Jacob Vosmaer requested to merge branch-exists-redis into master

What does this MR do?

Change Repository#branch_exists? so that it uses Repository#branch_names, which is cached in Redis.

Are there points in the code the reviewer needs to double check?

Why was this MR needed?

Memoizing in the Repository instance lead to a performance degradation. https://gitlab.com/gitlab-org/gitlab-ce/issues/40349.

Screenshots (if relevant)

Does this MR meet the acceptance criteria?

What are the relevant issue numbers?

Closes https://gitlab.com/gitlab-org/gitlab-ce/issues/40349

Edited by Jacob Vosmaer

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