[MGMT-18378] allow CNV on ARM as dev preview

[eifrach]

• Enabling CNV for ARM platfrom for versions 4.14+ as tech preview
• Adding unit-tests for CNV

List all the issues related to this PR

• [ ] New Feature
• [X] Enhancement
• [ ] Bug fix
• [ ] Tests
• [ ] Documentation
• [ ] CI/CD

What environments does this code impact?

• [ ] Automation (CI, tools, etc)
• [ ] Cloud
• [ ] Operator Managed Deployments
• [x] None

How was this code tested?

• [X] assisted-test-infra environment
• [ ] dev-scripts environment
• [ ] Reviewer's test appreciated
• [ ] Waiting for CI to do a full test run
• [ ] Manual (Elaborate on how it was tested)
• [x] No tests needed