Fix occasional deadlocks when doing multiple similar syncs concurrently. #1653
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Forcing deadlocks requires a lot of time and pulpcore-workers running.
There is therefore no specific CI test for this, but there is a reproducer
script that will force deadlocks to happen (and show that they're fixed) here:
https://github.com/ggainey/pulp_startup/blob/main/8750_deadlocks/file_repro.sh
backports #8750
fixes #9379
(cherry picked from commit 6af3519)