sstables: Add test_sstable_reader_on_unknown_column
sstables: Add test_sstable_reader_on_unknown_column

This test checks that sstable reader throws an exception
when sstable contains a column that's not present in the schema.

It also checks that dropped columns do not cause exceptions.

Signed-off-by: Piotr Jastrzebski <2c0eb4a25a7cde333ff2d0860cb06051925fd74f@scylladb.com>

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