K8SSAND-1645 ⁃ If no finalizer is present, skip deletion process

[burmanm]

What happened?
If there's no finalizer present, we shouldn't do our finalizer processing. This means deletion of PVCs, blocking deletion and possibly decommission a datacenter (among other things).

However, we add finalizer in our process if it is removed. As such, we need an annotation that prevents the re-adding of that annotation (or even adding it at all).

Did you expect to see something different?

How to reproduce it (as minimally and precisely as possible):

Environment

• Cass Operator version:

  Insert image tag or Git SHA here

  * Kubernetes version information:

  kubectl version

  * Kubernetes cluster kind:

insert how you created your cluster: kops, bootkube, etc.

• Manifests:

insert manifests relevant to the issue

• Cass Operator Logs:

insert Cass Operator logs relevant to the issue here

Anything else we need to know?:

┆Issue is synchronized with this Jira Task by Unito
┆friendlyId: K8SSAND-1645
┆priority: Medium

[burmanm]

k8ssandra/k8ssandra-operator#615