[az confcom acipolicygen] Command raises a sys.exit() after generation of the policy

### Describe the bug

The az confcom acipolicygen command raises a sys.exit(0) after the generation of the policy. Using scripts to invoke the command causes the process to exit, unless launched in a subprocess.

### Related command

az confcom acipolicygen

### Errors

N/A

### Issue script & Debug output

N/A

### Expected behavior

THe process should not exit after the command has run successfully. The command should just return the value instead of calling sys.exit()

### Environment Summary

azure-cli 2.59.0 *

core 2.59.0 *
telemetry 1.1.0

Extensions:
aks-preview 0.5.146
arcappliance 0.2.32
azure-devops 0.26.0
cleanroom 0.0.1
confcom 0.5.0a1
connectedk8s 1.3.20
k8s-extension 1.4.2
managedccfs 0.2.0
providerhub 0.2.0

Dependencies:
msal 1.27.0
azure-mgmt-resource 23.1.0b2

Python location '/opt/az/bin/python3'
Extensions directory '/home/hprabh/.azure/cliextensions'
Development extension sources:
/home/hprabh/code/azure-cleanroom

### Additional context

_No response_