fix(lwt longevity): filter out mutation errors on system.paxos
fix(lwt longevity): filter out mutation errors on system.paxos

Filter system.paxos mutation errors in LWT test (Roy's request)

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