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ci: wait for control-plane nodes before labeling in chart install

kubectl label with a label selector silently succeeds (exit 0) when no
nodes match, which causes the subsequent helm install to fail because
no nodes have the kube-ovn/role=master label. This happens intermittently
in Talos installation tests when the control-plane node has not yet
registered its node-role.kubernetes.io/control-plane label at the time
install-chart runs.

Add a polling loop (up to 120s) that waits for at least one node with
the control-plane label to appear before running kubectl label.

Signed-off-by: Mengxin Liu <liumengxinfly@gmail.com>
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Signed-off-by: Mengxin Liu <liumengxinfly@gmail.com>