Automatically infer infra cr GVK

[alvaroaleman]

What this PR does / why we need it:
We currently require the type meta on the infra CR to be set correctly
which isn't done by default. Infer it instead to simplify implementing
new providers and remove one possible source of errors.

/assign @enxebre

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:
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• This change includes unit tests.

[openshift-ci]

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This pull-request has been approved by: alvaroaleman

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[enxebre]

For ref:
We can't simply infraCR.GetObjectKind().GroupVersionKind() as it comes empty because the client strips the metadata kubernetes/client-go#541.

GVKForObject works because it looks at the schema https://github.com/kubernetes-sigs/controller-runtime/blob/v0.11.0/pkg/client/apiutil/apimachinery.go#L76.

Thanks @alvaroaleman!
/lgtm

[openshift-ci]

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