Replace use of k8ssandra-tools with k8ssandra-client for CRD upgrades

[burmanm]

What is missing?
CRD upgrader in Helm charts is using old k8ssandra 1.x k8ssandra-tools image. This is old and not maintained, instead we should use the k8ssandra-client image which has the same functionality.

Why do we need it?

Environment

• K8ssandra Operator version:

  Insert image tag or Git SHA here

Anything else we need to know?:

┆Issue is synchronized with this Jira Story by Unito
┆Issue Number: K8OP-283

[sync-by-unito]

➤ Michael Burman commented:

This is to reduce the CVE scans.