OCPBUGS-72407: add defaults for allowedRegistriesForImport that keep current behavior

[dusk125]

This PR provides defaults that will keep the current behavior even with the change from allow-all to deny-all introduced here: openshift/openshift-apiserver#608.

This fix and the fix linked above will be backported to all supported releases to resolve OCPBUGS-72407.

[openshift-ci-robot]

@dusk125: This pull request references Jira Issue OCPBUGS-72407, which is invalid:

• release note text must be set and not match the template OR release note type must be set to "Release Note Not Required". For more information you can reference the OpenShift Bug Process.
• expected dependent Jira Issue OCPBUGS-72408 to be in one of the following states: VERIFIED, RELEASE PENDING, CLOSED (ERRATA), CLOSED (CURRENT RELEASE), CLOSED (DONE), CLOSED (DONE-ERRATA), but it is POST instead

Comment /jira refresh to re-evaluate validity if changes to the Jira bug are made, or edit the title of this pull request to link to a different bug.

The bug has been updated to refer to the pull request using the external bug tracker.

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In response to this:

This PR provides defaults that will keep the current behavior even with the change from allow-all to deny-all introduced here: openshift/openshift-apiserver#607

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[openshift-ci]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: dusk125
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[openshift-ci]

@dusk125: all tests passed!

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