az containerapp create --yaml: issue with userAssignedIdentities

### Describe the bug

`az containerapp create --yaml` does mess up the resource group and user assigned identities if they contain `-` or `_`.

The id
`/subscriptions/my-subscription-id/resourcegroups/my_resource_group_dev/providers/Microsoft.Managedidentity/Userassignedidentities/my-user-assigned-identity`

somehow gets changed to

`/subscriptions/my-subscription-id/resourcegroups/myResourceGroupDev/providers/Microsoft.Managedidentity/Userassignedidentities/My-User-Assigned-Identity`

on is then now found

### Related command

`az containerapp create`

### Errors

ERROR: (FailedIdentityOperation) Identity operation for resource `'/subscriptions/my-subscription-id/resourceGroups/my_resource_group/providers/Microsoft.App/containerApps/my-container-app'` failed with error 'Failed to perform resource identity operation. Status: 'BadRequest'. Response: `'{"error":{"code":"BadRequest","message":"Resource '/subscriptions/my-subscription-id/resourcegroups/myResourceGroup/providers/Microsoft.Managedidentity/Userassignedidentities/My-User-Assigned-Identity' was not found."}}'.'.`

### Issue script & Debug output

`az containerapp create -g my_resource_group -n my-container-app --yaml template.json`

with template.json containing:
```
{
"identity": {
"type": "UserAssigned",
"userAssignedIdentities": {
"/subscriptions/my-subscription-id/resourcegroups/my_resource_group /providers/Microsoft.ManagedIdentity/userAssignedIdentities/my-user-assigned-identity": {}
}
},
```

[debug.log](https://github.com/Azure/azure-cli/files/12455244/debug.log)

### Expected behavior

The container app is created with user assigned identity

### Environment Summary

`azure-cli 2.51.0`
`core 2.51.0`
`telemetry 1.1.0`
Extensions:
`containerapp 0.3.37`
Dependencies:
`msal 1.24.0b1`
`azure-mgmt-resource 23.1.0b2`

Can be reproduces on WSL/Ubuntu and container image `mcr.microsoft.com/azure-cli`

### Additional context

_No response_