azurerm_kubernetes_cluster - set host_encryption_enabled and remove 4.0 flags

[catriona-m]

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Description

This PR fixes a bug where host_encryption_enabled is not being set correctly and removes 4.0 flags around these since 4.0 has now been released

PR Checklist

• I have followed the guidelines in our Contributing Documentation.
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Change Log

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• azurerm_kubernetes_cluster - host_encryption_enabled and node_public_ip_enabled are now set correctly

This is a (please select all that apply):

• Bug Fix
• New Feature (ie adding a service, resource, or data source)
• Enhancement
• Breaking Change

Related Issue(s)

Fixes #27201

Note

If this PR changes meaningfully during the course of review please update the title and description as required.

[slushysnowman]

Would be great if this could be merged, this is a disruptive bug...

[stephybun]

Thanks @catriona-m LGTM 👍

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