Support for azurerm_kubernetes_cluster OMS Agent Identity export

[aristosvo]

Fixes #6998

Acceptance test results:

--- PASS: TestAccAzureRMKubernetesCluster_addonProfileOMS (1077.69s)
--- PASS: TestAccAzureRMKubernetesCluster_addonProfileOMSToggle (2157.25s)
--- PASS: TestAccDataSourceAzureRMKubernetesCluster_addOnProfileOMS (1092.76s)

Example of implemented TerraForm config

Resource

resource "azurerm_role_assignment" "aks-mmp" {
  scope                = ${var.random_scope}
  role_definition_name = ${var.random_role_definition_name}
  principal_id         = azurerm_kubernetes_cluster.aks.addon_profile.0.oms_agent.0.oms_agent_identity.0.client_id
}

Data Source

resource "azurerm_role_assignment" "aks-mmp" {
  scope                = ${var.random_scope}
  role_definition_name = ${var.random_role_definition_name}
  principal_id         = data.azurerm_kubernetes_cluster.aks.addon_profile.0.oms_agent.0.oms_agent_identity.0.client_id
}

Naming considerations

I would have preferred identity over oms_agent_identy, but to avoid confusion with the already present identity block in the documentation I stuck with oms_agent_identity.

[tombuildsstuff]

LGTM - thanks for this @aristosvo

[tombuildsstuff]

Acceptance Tests pass:

[ghost]

This has been released in version 2.12.0 of the provider. Please see the Terraform documentation on provider versioning or reach out if you need any assistance upgrading. As an example:

provider "azurerm" {
    version = "~> 2.12.0"
}
# ... other configuration ...

[ghost]

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