fix(k8s-perf): reuse idle resources on scylla nodes
fix(k8s-perf): reuse idle resources on scylla nodes

For the moment we exclude more than 2 full CPU cores on scylla nodes
explicitely and lion part of it stays idle forever.

So, calculate resource limits for scylla pods more accurate to reuse
more resources.

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