Support for UserAssignedIdentity in azurerm_storage_account

[yupwei68]

Fix #11751

--- PASS: TestAccStorageAccount_systemAssignedIdentity (160.00s)
--- PASS: TestAccStorageAccount_userAssignedIdentity (171.82s)
--- PASS: TestAccStorageAccount_systemAssignedUserAssignedIdentity (171.53s)
--- PASS: TestAccStorageAccount_updateResourceByEnablingIdentity (421.15s)

[yupwei68]

Thanks kt for your comments.
I've updated according to your comment. But on fact, I still think making identity Computed prevents users from disabling identity.
All tests have passed.
Please continue reviewing.

[katbyte]

Thanks @yupwei68 - LGTM 👍

[ghost]

This has been released in version 2.63.0 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 = "~> 2.63.0"
}
# ... other configuration ...

[github-actions]

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