ACR self.cmd did not detect command failure

### Describe the bug

ACR team uses the self.cmd command to confirm that our command successfully runs with no errors. However, we have noticed that our test using self.cmd still passes even though our `acr agentpool delete` command returns an error

https://github.com/Azure/azure-cli/blob/f92f7233659890b427f4f6f486db5610cdca1020/src/azure-cli/azure/cli/command_modules/acr/tests/latest/test_acr_agentpool_commands.py#L67

### Related command

acr agentpool delete -n {agents2_name} -r {registry_name}

### Errors

NA

### Issue script & Debug output

NA

### Expected behavior

Test fail when command returns an error message

### Environment Summary

`{
"auzre-cli": "2.67.0",
"azure-cli-core": "2.67.0",
"azure-cli-telemetry": "1.1.0",
"extensions": {
"acrtransfer": "1.1.0"
}
}`

### Additional context

_No response_