user_assigned_identity: add state migration for ID casing

[favoretti]

Old user_assigned_identity are saved in the state with resourcegroups all in lowercase, forcing all resource that use it's .id property reference do a lowercasing dance every plan/apply.
This should fix the problem.

[tombuildsstuff]

hey @favoretti

Thanks for this PR :)

Taking a look through this mostly LGTM - if we can update the State Migration to parse the existing ID to account for one subtle bug then this should otherwise LGTM 👍

Thanks!

[tombuildsstuff]

LGTM 👍

[tombuildsstuff]

Tested locally looks good 👍

[ghost]

This has been released in version 2.44.0 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 = "~> 2.44.0"
}
# ... other configuration ...

[ghost]

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