reef: osd: Add memstore to unsupported objstores for QoS

[k0ste]

backport tracker: https://tracker.ceph.com/issues/64168

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backport of https://github.com/ceph/ceph/pull/52530 parent tracker: https://tracker.ceph.com/issues/59531

this backport was staged using ceph-backport.sh version 16.0.0.6848 find the latest version at https://github.com/ceph/ceph/blob/main/src/script/ceph-backport.sh