tests: copy the sstable with an unknown component to the data directory
tests: copy the sstable with an unknown component to the data directory

We will be creating links to those sstable's files, and those don't work
if the data directory and the test sstable are on different devices.

Copying the files to the same directory fixes the problem.
Message-Id: <a37b09261beef6d7c97bd0e3b78d830079c98083@scylladb.com>

duarten/scylla,duarten/scylla,duarten/scylla,avikivity/scylla,scylladb/scylla,scylladb/scylla,scylladb/scylla,avikivity/scylla,avikivity/scylla,scylladb/scylla