schrej: 🌱 kcp: add log message when cluster infra not ready

JobBuild
5468
10-21 11:42
pull-cluster-api-apidiff-main 1451151947838001152
pull-cluster-api-build-main 1451151947804446720
pull-cluster-api-e2e-ipv6-main 1451151948039327744
pull-cluster-api-e2e-main 1451151947984801792
pull-cluster-api-test-main 1451151947909304320
pull-cluster-api-test-mink8s-main 1451151947947053056
pull-cluster-api-verify-main 1451151947871555584