cdc: include information about all PKs in trace
cdc: include information about all PKs in trace

This fixes a bug in CDC mutation augmentation logic. A lambda that is
called for each partition key in a batch captures a trace state pointer,
but moves it out after being called for the first time. This caused CDC
tracing information to be included only for one of the partition keys
of the batch.

Fixes #6575

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