kubevirt / containerized-data-importer / #5883

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use headless service for upload server (#4052)

apparently there's no k8s API that says
"kube-proxy has synced iptables rules for this service on all nodes"
so pod readiness/healthz (even endpointslices) could all report
success but the client would still face a connection refused.

we faced something similar in virtctl
https://github.com/kubevirt/containerized-data-importer/pull/3545

arguably, a headless service was the right fit for us anyway
and cuts the above overhead out of the equation.

Signed-off-by: Alex Kalenyuk <akalenyu@redhat.com>

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