improvement(cdc_replication_test): wait for replicator to finish a bit longer
improvement(cdc_replication_test): wait for replicator to finish a bit longer

60s may not be enough for the replicator to catch the most recent
changes.

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