external binary image: retry with RELEASE_IMAGE_LATEST

[stbenjam]

When using a disconnected install, the image registry may not be accessible to the build cluster. Even if we do make it accessible via proxy tricks, origin might not have a pull secret for it, or trust its CA. If RELEASE_IMAGE_LATEST is specified, fall back to it for external binary extraction.

[openshift-ci[bot]]

Skipping CI for Draft Pull Request. If you want CI signal for your change, please convert it to an actual PR. You can still manually trigger a test run with /test all

[stbenjam]

/test e2e-metal-ipi-ovn-ipv6

[openshift-ci[bot]]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: stbenjam

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[openshift-ci[bot]]

@stbenjam: 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/e2e-gcp-ovn-builds	e68c20e480a1ce37eda2b4d4542a672e3e773270	link	true	/test e2e-gcp-ovn-builds

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