Add initial support for controlplanetopology=external

[alvaroaleman]

In hypershift, the controlplane components are not selfhosted but run in a different cluster. This means that certain assertions like "find openshift-controller-manager pod and check if its log contains a specific line" can not work.

Luckily, the changes in behavior for this were already implemented for the IBMCloud provider, this PR is mostly about plugging the Controlplanetopology field through the testcontext and and treating a value of external identical to "ibmcloud" in util.WaitForInternalRegistryHostname (There will likely be more followups to switch behavior based on this).

/cc @csrwng

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

[openshift-ci]

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[openshift-ci]

@alvaroaleman: The following test failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
ci/prow/verify-deps	843ecd9	link	true	/test verify-deps

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[alvaroaleman]

/hold

I didn't realize the framework is an import, seems I have to find another global for this

[alvaroaleman]

Plugging the controlplanetopology setting through will likely be done in #26537

[openshift-ci]

@alvaroaleman: PR needs rebase.

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