Cilium: Implement node encryption

[zadjadr]

Fixes: #15853

In 1.13 and below, the node encryption only works with IPsec and from 1.14 and above it only works with wireguard.

There is no extra validation added, because the setting will be ignored if you have wiredguard + nodeEncryption + cilum 1.13 or ipsec + nodeEncryption + cilium 1.14.

[k8s-ci-robot]

Hi @zadjadr. Thanks for your PR.

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[hakman]

/ok-to-test

[zadjadr]

@hakman can this be merged?

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: hakman

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[hakman]

/retest