fix(data validator): prevent to duplicate of copying test data
fix(data validator): prevent to duplicate of copying test data

If same user profile is called in parallel, the same MVs will be included few time in the list and
test data will be copied a few times. Return list of unique MVs to prevent to duplicate
of copying test data

scylladb/scylla-longevity-tests,scylladb/scylla-longevity-tests,scylladb/scylla-longevity-tests,scylladb/scylla-cluster-tests,scylladb/scylla-cluster-tests,scylladb/scylla-cluster-tests,scylladb/scylla-cluster-tests,scylladb/scylla-cluster-tests