Add support for oms_agent_identity in oms_agent block in azurerm_kubernetes_cluster

[aalmog999]

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Description

The azurerm_kubernetes_cluster resource in the Terraform azurerm provider supports configuring oms_agent_identity inside the oms_agent block for specifying a User-Assigned Managed Identity for monitoring purposes.
However, the current version of the Azure/aks/azurerm module (version 9.3.0) does not expose or support this oms_agent_identity block.
Adding this feature would allow users to specify a custom User-Assigned Managed Identity for the Azure Monitor agent when deploying an AKS cluster through this module.

Current Behavior:
Currently, the module allows setting up oms_agent but does not provide the ability to configure oms_agent_identity and
trying to disable the current configuration.

Expected Behavior:
The module should support an oms_agent_identity block under oms_agent to allow users to specify a User-Assigned
Managed Identity for the OMS agent.

New or Affected Resource(s)/Data Source(s)

azurerm_kubernetes_cluster

Potential Terraform Configuration

References

No response