azurerm_kubernetes_cluster - various 4.0 changes

[stephybun]

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Description

This PR contains the following changes for 4.0:

• Removes the default values for image_cleaner_enabled and image_cleaner_interval_hours, closes Support image_cleaner block doesn't work as expected #19654
• Renames automatic_channel_upgrade - > automatic_upgrade_channel (to better align with the API)
• Renames node_os_channel_upgrade - > node_os_upgrade_channel (to better align with the API)
• Lowers the upper limit for the idle_timeout_in_minutes validation function

[tombuildsstuff]

A couple of minor comments but 👍

[github-actions]

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