azurerm_disk_pool azurerm_disk_pool_iscsi_target azurerm_disk_pool_iscsi_target_lun azurerm_disk_pool_managed_disk_attachment - Remove registration for Microsoft.StoragePool and add deprecation message for affected resources

[lonegunmanb]

As #18820 pointed out, all new subscriptions will meet issue on plugin's startup because Azure has halted the preview of Azure Disk Pools. The subscriptions which have registered Microsoft.StoragePool can still call the registration API and use disk pool API, and new subscriptions need an explicit skip_provider_registration to skip this registration.

This pr removed Microsoft.StoragePool from the required resource provider list to avoid such error so the new subscriptions don't need this skip_provider_registration anymore.

[lonegunmanb]

Hi, as @tombuildsstuff kindly suggested, I've add deprecation message to those resources, and remove registration for Microsoft.StoragePool, would you please give this pr a review @stephybun @tombuildsstuff ? Thanks!

[katbyte]

LGTM 🎱

[github-actions]

This functionality has been released in v3.29.0 of the Terraform Provider. Please see the Terraform documentation on provider versioning or reach out if you need any assistance upgrading.

For further feature requests or bug reports with this functionality, please create a new GitHub issue following the template. Thank you!

[github-actions]

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