azurerm_kubernetes_cluster - allow resizing of default_node_pool

[stephybun]

Closes #7093

[katbyte]

Aside from a couple comments LGTM ☔

[alexkrebiehlKR]

Would it make sense for the provider to generate a temporary name by default? Needing to specify the temporary name to make the provider behave as you’d expect (i.e. don’t destroy the cluster when resizing) seems like an opportunity for users to accidentally destroy their cluster if they don’t know that setting exists or what it does.

[tombuildsstuff]

One comment around the naming for this field, since this is likely to be used for other fields in the future - but this otherwise LGTM 👍

[github-actions]

This functionality has been released in v3.47.0 of the Terraform Provider. Please see the Terraform documentation on provider versioning or reach out if you need any assistance upgrading.

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[github-actions]

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