Draft: Add non-blocking way to pop JobWaiter list
What does this MR do and why?
JobWaiter#wait
uses BLPOP
which is a blocking call to Redis and pops a
single element from the list.
This is an experiment with using LPOP which can pop off many elements at the same time to achieve the same thing.
For the Import and Integrate team's use of JobWaiter
this method might
be more performant.
https://gitlab.com/gitlab-org/manage/import-and-integrate/discussions/-/issues/61#note_1748410729
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