kubeadm: EtcdLearnerMode is beta in v1.29

[pacoxu]

Since kubernetes/kubernetes#120228 is merged.

• commit 42e282b is from kubeadm: update feature gates and add removed FGs #42771
• the only change is e91265b: update EtcdLearnerMode beta in v1.29

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[sftim]

/retitle [WIP] [placeholder] kubeadm: EtcdLearnerMode is beta in v1.29

You can remove the [WIP] if you hold the PR @pacoxu. We need some way to tell Prow that this isn't ready to merge.

[pacoxu]

/hold

Thanks for the comments and I will wait to see if there are other FG changes in v1.29 later in this release cycle.
I will update the PR later.

[pacoxu]

/unhold

@sftim do you have time to take a look?

[pacoxu]

/cc @neolit123

[neolit123]

/lgtm

[k8s-ci-robot]

LGTM label has been added.

Git tree hash: a0ed559c8ca071877314d17176093ae892957f45

[sftim]

/sig cluster-lifecycle
/approve

[k8s-ci-robot]

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