fix(k8s-eks): use new namespaces for operator and manager
fix(k8s-eks): use new namespaces for operator and manager

Operator and manager namespaces were hardcoded recently in the
operator repo [1].
So, start using hardcoded values for namespaces of operator and
manager to make SCT be compatible with latest operator versions.
Note that it is still compatible with old versions.

[1] https://github.com/scylladb/scylla-operator/pull/667

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