Fix UCP test (radius-project#7694)

# Description

looks like radius-project#7640 broke one
of the ucp tests. this PR fixes the test

<img width="304" alt="image"
src="https://github.com/radius-project/radius/assets/32342549/13a1b083-2de0-426a-ad0d-f5870cb3ee80">


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Fixes: #issue_number

---------

Signed-off-by: willdavsmith <willdavsmith@gmail.com>

pkg/cli/credential/azure_credential_management.go

@@ -125,14 +125,7 @@ func (cpm *AzureCredentialManagementClient) Get(ctx context.Context, credentialN
 		return ProviderCredentialConfiguration{}, err
 	}
 
-	azureCredential, ok := resp.AzureCredentialResource.Properties.(*ucp.AzureCredentialProperties)
-	if !ok {
-		return ProviderCredentialConfiguration{}, clierrors.Message("Unable to find credentials for cloud provider %s.", AzureCredential)
-	}
-
-	azureCredentialKind := azureCredential.GetAzureCredentialProperties().Kind
-
-	switch *azureCredentialKind {
+	switch *resp.AzureCredentialResource.Properties.GetAzureCredentialProperties().Kind {
 	case ucp.AzureCredentialKindServicePrincipal:
 		azureServicePrincipal, ok := resp.AzureCredentialResource.Properties.(*ucp.AzureServicePrincipalProperties)
 		if !ok {