[BUG] `Microsoft.ContainerRegistry` @ `2023-07-01` - `IdentityProperties` for `CredentialSets` define identity modes not supported by the API

[stephybun]

API Spec link

azure-rest-api-specs/specification/containerregistry/resource-manager/Microsoft.ContainerRegistry/stable/2023-07-01/containerregistry.json

Lines 2754 to 2756 in aa4ba9e

	"SystemAssigned",
	"UserAssigned",
	"SystemAssigned, UserAssigned",

API Spec version

2023-07-01

Describe the bug

The spec defines support for UserAssigned and SystemAssigned, UserAssigned identities for CredentialSets, but when trying to create a Credential Set with either of these identity modes an API error is returned:

{
  "error": {
    "code": "CannotSetResourceIdentity",
    "message": "Resource type 'Microsoft.ContainerRegistry/registries/credentialSets' does not support creation of 'UserAssigned' resource identity. The supported types are 'SystemAssigned'."
  }
}

{
  "error": {
    "code": "CannotSetResourceIdentity",
    "message": "Resource type 'Microsoft.ContainerRegistry/registries/credentialSets' does not support creation of 'SystemAssigned, UserAssigned' resource identity. The supported types are 'SystemAssigned'."
  }
}

Expected behavior

That only SystemAssigned is defined for the type field in IdentityProperties, or the API is updated to support these modes.

Actual behavior

Identity types are defined that are not supported by the API

Reproduction Steps

Try and create a Credential Set resource with UserAssigned or SystemAssigned, UserAssigned Identity via the API

Environment

No response

[v-jiaodi]

@AntonioVT Please help take a look, thanks.