[DO NOT MERGE: BROKEN] Attempting to fix Azure backups in terraform

[sgibson91]

This PR documents what I tried as part of:

• [Spike: 2h] Fix storage backups for Azure clusters #4487

The terraform plan is clean, however during apply, I get the following error:

│ Error: [ERROR] fileshare 'homes' not found in protectable or protected fileshares, make sure Storage Account "2i2cutorontohubstorage" is registered with Recovery Service Vault "homedir-recovery-vault" (Resource Group "2i2c-utoronto-cluster")
│ 
│   with azurerm_backup_protected_file_share.homes,
│   on storage.tf line 76, in resource "azurerm_backup_protected_file_share" "homes":
│   76: resource "azurerm_backup_protected_file_share" "homes" {

Googling the error, this was apparently fixed upstream in v2.86.0, and we are using v3.111, so I'm not sure why we are still seeing this.

• Storage account registration and Azure File Share Backup hashicorp/terraform-provider-azurerm#14056

[sgibson91]

I tried to see if I could manually configure the backup in the Azure Portal, but the file share cannot be discovered

[sgibson91]

Aha!