[WIP] [v2] Ensure MachineAPI is enabled before trying to use its resources

[clobrano]

Why we need this PR

Currently, NHC only checks if it runs on OCP before trying to access MachineAPI resources, however not all OCP clusters have MachineAPI enabled and the controller fails to start in such conditions.

Changes made

Changes made

• Verify if MachineAPI is in the list of the Cluster's EnabledCapabilities for OCP v4.14+
• Verify the existence of machine.openshift.io Group for OCP < v.4.14

Which issue(s) this PR fixes

https://issues.redhat.com/browse/ECOPROJECT-1902

[openshift-ci[bot]]

Skipping CI for Draft Pull Request. If you want CI signal for your change, please convert it to an actual PR. You can still manually trigger a test run with /test all

[openshift-merge-robot]

PR needs rebase.

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[openshift-ci[bot]]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: clobrano

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[clobrano]

Uhm, it doesn't contain all the commits I expected