🐛 InfrastructureRef and ControlPlaneRef CRD version

[guilhem]

What this PR does / why we need it:

The current implementation takes the version from cluster CRD (v1beta2). But providers could be at another version.

Current implementation breaks any provider without a v1beta2 CRD.

Which issue(s) this PR fixes (optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close the issue(s) when PR gets merged):
Fixes #479

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[k8s-ci-robot]

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[mboersma]

/ok-to-test

[mboersma]

/lgtm
/approve

Thanks @guilhem, apologies for the oversight. (We really need some integration test with upstream providers for CAAPH.)

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: guilhem, mboersma

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