ISSUE-885 | feat: Implement no-cni for HCP clusters

[paulczar]

What this PR does / why we need it:

reviving PR-903

Makes it possible to configure a HCP cluster without a CNI, like with rosa cluster create --no-cni

Implementing it like the rosa CLI does it: https://github.com/openshift/rosa/blob/4f425f6d857bb7b1ddb7af8fc69a25d25ce8fae3/pkg/ocm/clusters.go#L939

Which issue(s) this PR fixes (optional, use fixes #<issue_number>(, fixes #<issue_number>, ...) format, where issue_number might be a GitHub issue, or a Jira story (OCM-xxxx):
Fixes #885

[openshift-ci]

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[openshift-ci]

Hi @paulczar. Thanks for your PR.

I'm waiting for a terraform-redhat member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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