test/store_test: enforce sync compaction for spillover test cases.
Merging https://github.com/ceph/ceph/pull/57107 updated BlueFS data
layout for some of spillover tests. This has negative impact (broken
test cases) in Quincy release only though.
See https://tracker.ceph.com/issues/67838.
But let's rollback to the original "sync compaction" behavior for other
releases as well. Just in case...
Signed-off-by: Igor Fedotov <igor.fedotov@croit.io>