Fix --extra-config=etcd.* producing invalid kubeadm config

[noamcohen97]

TestGenerateKubeadmYAML now verifies that every successful render is parseable YAML, and a new etcd-extra-args case so the bug is caught by the existing test.

The original PR (#22575) addressing this is stale, so opening this as a replacement.

Diff

 etcd:
   local:
-    dataDir: /var/lib/minikube/etcd    extraArgs:
+    dataDir: /var/lib/minikube/etcd
+    extraArgs:
       - name: "listen-metrics-urls"
         value: "http://0.0.0.0:2381"

Fixes #21840

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[minikube-bot]

Can one of the admins verify this patch?

[noamcohen97]

/kind bug