If PodDeletionTimestamp != nil, return Pod state as being Terminating

[burmanm]

What this PR does: Modify the metrics state of the pods to return Terminating if DeletionTimestamp is not nil and we are not decommissioning it.

Which issue(s) this PR fixes: Fixes #

Checklist

• [ ] Changes manually tested
• [x] Automated Tests added/updated
• [ ] Documentation added/updated
• [ ] CHANGELOG.md updated (not required for documentation PRs)
• [x] CLA Signed: DataStax CLA

[github-actions[bot]]

No linked issues found. Please add the corresponding issues in the pull request description.
Use GitHub automation to close the issue when a PR is merged