Stream blobs when sync containers to secondary

We currently use a temporary file, if a few downloads are happening they can use significant space of /tmp directory. Sometimes it can even create problems https://gitlab.com/gitlab-com/geo-customers/-/issues/102 In 15.7 we moved container repository sync to SSF where concurrency is not controlled individually for them, instead, blob concurrency is used. Potentially, it will have a large impact on Geo customers.