Improve the performance of concurrency limit
What does this MR do and why?
This MR improves the performance of the concurrency limit middleware by introducing a lease key. It ensures that only the job with the lease can update the cache when the rest of the jobs using the existing cached value.
Context: https://gitlab.com/gitlab-com/gl-infra/scalability/-/issues/3775#note_2089502716
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Edited by Dmitry Gruzd