Refactor after 4.10 validation hooks

[jeniawhite]

Environment info

• NooBaa Operator Version: VERSION
• Platform: Kubernetes 1.14.1 | minikube 1.1.1 | OpenShift 4.1 | other: specify

Actual behavior

1. Left gaps to remove after 4.10 K8S validation hooks
2. This issue consists of PRs and code flows that need to be removed/refactored with the introduction of validation hooks

Expected behavior

Steps to reproduce

More information - Screenshots / Logs / Other output

[jeniawhite]

https://github.com/noobaa/noobaa-operator/pull/693 https://github.com/noobaa/noobaa-operator/pull/695

[kfir-payne]

https://github.com/noobaa/noobaa-operator/pull/688