fix(ho): Use v1alpha1 ownerRef for future CPO managed components

[hasueki]

What this PR does / why we need it:
Updates HO to continue using v1alpha1 ownerRefs for components (cluster-autoscaler, machine-approver, ignition-server) that will eventually move to CPO management. This will be the case for HCs < 4.12.

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:
Fixes #1955

Checklist

• Subject and description added to both, commit and PR.
• Relevant issues have been referenced.
• This change includes docs.
• This change includes unit tests.

[enxebre]

/hold
to prevent ci from rerunning in this high prio PR

[enxebre]

/hold cancel

[hasueki]

@csrwng Updated based on your feedback. Please re-review when you get a chance.

[csrwng]

/lgtm

[csrwng]

/approve

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: csrwng, hasueki

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[openshift-ci]

@hasueki: all tests passed!

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