fix(k8s-eks): gather monitoring set data correctly
fix(k8s-eks): gather monitoring set data correctly

"k8s-eks" backend is new one and it is missing in the
monitoring logs gathering logic.
So, fix it by making backend checks be "k8s-eks"-aware.

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