fix(helm-versions): make 'latest' helm charts work again
fix(helm-versions): make 'latest' helm charts work again

If we specify 'latest' as a version for the operator Helm charts then
we get following error:

    chart "scylla-operator" version "1.6.0a0" not found ...

The reason for it is that real chart version that is '1.6.0-alpha.0'
gets transformed to the '1.6.0a0' and since we need direct matching of
strings we fail to match any helm version here.
So, switch to usage of the 'LegavyVersion' class instead of 'Version'
one processing list of Helm charts versions to get not transformed
strings.

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