fix(disrupt_add_drop_column) add missing _set_current_disruption
fix(disrupt_add_drop_column) add missing _set_current_disruption

adding for logs description of disrupt_add_drop_column

Signed-off-by: Shoshan Dagany <59e0bba14feb3635cc3baaab233841697bfaa642@scylladb.com>

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