Polling for kubeconfig secret prints to stdout

[mboersma]

The polling messages while we're waiting for the workload cluster's kubeconfig secret are being printed to the terminal, but should be hidden by default:

% az capi create -l westus3 -k v1.24.1 -n echoed-instinct
...
Do you want to use kind-capi-manager as the management cluster? (y/n): y
✓ Generated workload cluster configuration at "echoed-instinct.yaml"
✓ Created workload cluster "echoed-instinct"
Error: "echoed-instinct-kubeconfig" not found in namespace "default": secrets "echoed-instinct-kubeconfig" not found
Error: "echoed-instinct-kubeconfig" not found in namespace "default": secrets "echoed-instinct-kubeconfig" not found
Error: "echoed-instinct-kubeconfig" not found in namespace "default": secrets "echoed-instinct-kubeconfig" not found
Error: "echoed-instinct-kubeconfig" not found in namespace "default": secrets "echoed-instinct-kubeconfig" not found
Error: "echoed-instinct-kubeconfig" not found in namespace "default": secrets "echoed-instinct-kubeconfig" not found
Error: "echoed-instinct-kubeconfig" not found in namespace "default": secrets "echoed-instinct-kubeconfig" not found
Error: "echoed-instinct-kubeconfig" not found in namespace "default": secrets "echoed-instinct-kubeconfig" not found

New clusterctl version available: v1.1.3 -> v1.1.4
https://github.com/kubernetes-sigs/cluster-api/releases/tag/v1.1.4
✓ Workload cluster is accessible