sstableloader reports LEAK

[tchaikov]

ERROR 04:25:27,961 LEAK DETECTED: a reference (org.apache.cassandra.utils.concurrent.Ref$State@1b719a6a) to class org.apache.cassandra.io.sstable.format.SSTableReader$InstanceTidier@1643163436:/jenkins/workspace/scylla-master/gating-dtest-release/scylla/.dtest/dtest-6q93_sky/test/node1/data_copy/ks/counter1-90e8fc60366c11eebbad16d43da589c1/me-3-big was not released before the reference was garbage collected

see also

• Memory leak errors when running sstableloader scylladb#4190
• TestSSTableGenerationAndLoading::test_sstableloader_compression is flaky since May scylladb#14842