docker-hub-mirror/values.yaml: Use CR_DOCKER_HUB_MIRROR_FQDN
Use CR_DOCKER_HUB_MIRROR_FQDN instead of hard-coded docker-hub-mirror.cloud.releng.team.
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Use CR_DOCKER_HUB_MIRROR_FQDN instead of hard-coded docker-hub-mirror.cloud.releng.team.