[release/2.8 backport] Option to configure proxy cache TTL #4090
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Currently when registry is run as proxy it tries to cleanup unused blobs from its cache after 7 days which is hard-coded. This PR makes that value configurable. One can disable caching using this option.
Continue #3238
Fixes #2736
Fixes #2367
Fixes #3704
Fixes #3879
(cherry picked from commit 8fe4ca4)