fix(loader ami v5): set scylla-qa-loader-ami-lwt-v5 for multiks test
fix(loader ami v5): set scylla-qa-loader-ami-lwt-v5 for multiks test

Set loader ami to scylla-qa-loader-ami-lwt-v5 for multiks test, region eu-north-1

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