fix(cdc-options): update supported values for preimage
fix(cdc-options): update supported values for preimage

https://docs.scylladb.com/using-scylla/cdc/cdc-intro/
Per documentation true|false|full are the only that supported

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