Evaluation of final k8ssandra-terraform documentation for GKE

[sync-by-unito[bot]]

• Review and test final updates to terraform project
• Explore and confirm a functional deployment to GKE

┆Issue is synchronized with this Jiraserver Task by Unito ┆Epic: k8ssandra-terraform integration tests ┆Issue Number: K8SSAND-669 ┆Priority: Medium