Implement alternative Vertica provisioning to unblock GitHub build pipelines for Vertica SQL Go

[mkottakota1]

Problem:

Vertica images have been removed from Docker Hub, which caused our existing test cases to fail since they relied on those images.

Solution:

This PR provisions Vertica using Kubernetes instead of Docker Hub images. The setup ensures that all existing test cases continue to run successfully and in the same manner as before.

Testing & Validation

• Verified Vertica deployment inside KinD using the Vertica Operator and MinIO for communal storage.
• Confirmed Keycloak realm, client, and user provisioning for OAuth flows.
• Ran the full suite of Go driver tests (normal, OAuth, and TLS) against the Kubernetes‑provisioned Vertica cluster.
• All tests passed across the Go version matrix (1.18 through 1.22), ensuring compatibility and reproducibility.
• Logs and artifacts collected from CI runs validate readiness, connectivity, and TLS configuration.

[cbharadwajp]

Changes reviewed. Can be merged.