Infrastructure resource: Set controlPlaneTopology: External

[alvaroaleman]

This allows to detect that a cluster is a hypershift cluster which is
for example needed for tests.

Related enhancement is in
openshift/enhancements@46da245#diff-1f93c9be7f93ed45d04551f345307ebc6d5e8cd41d65afb97feb324b51bb3848

/assign @csrwng

Ref https://issues.redhat.com/browse/HOSTEDCP-257

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[csrwng]

@alvaroaleman we are currently broken when setting ControlPlaneTopology to External. We are waiting for this: openshift/cluster-ingress-operator#666

I am also changing it in this PR -> #539, but have not been able to merge because of the same reason

[alvaroaleman]

ah ok, thanks for the heads-up