az storage account create encountering "NetworkAclsValidationFailure" with exit code 0

### Describe the bug

Hi, I'm trying to enable nfsv3 for blob storage. I'm getting this error message in the result:

```
{
...
"error": {
"code": "NetworkAclsValidationFailure",
"message": "Validation of network acls failure: SubnetsHaveNoServiceEndpointsConfigured:Subnets aks of virtual network /subscriptions//resourceGroups//providers/Microsoft.Network/virtualNetworks/ do not have ServiceEndpoints for Microsoft.Storage resources configured. Add Microsoft.Storage to subnet's ServiceEndpoints collection before trying to ACL Microsoft.Storage resources to these subnets.."
},
...
}
```

It is very easy to replicate:

1. create a $RG + $VNET/$SUBNETsubnet pair
2. run below

```
az storage account create -g $RG -n $NAME \
--sku Standard_LRS \
--kind StorageV2 \
--enable-nfs-v3 --hns \
--default-action Deny \
--subnet "$SUBNET" --vnet-name "$VNET" --action "allow" \
--min-tls-version TLS1_2

echo $?
# we found 0 even with error above shown
```

### Related command

`az storage account create`

### Errors

See above description, notice that it should be an error response, but exit code is zero

### Issue script & Debug output

it is already apparent, don't think debug needed, but let me know

### Expected behavior

should exit 1 instead

### Environment Summary

azure-cli 2.79.0 *

core 2.79.0 *
telemetry 1.1.0

Extensions:
aks-preview 19.0.0b16
azure-iot-ops 0.4.0b3
k8s-configuration 2.0.0
k8s-extension 1.6.1
resource-graph 2.1.0
ssh 2.0.6

Dependencies:
msal 1.34.0b1
azure-mgmt-resource 23.3.0

Python location '/opt/az/bin/python3'
Config directory '/home/ubuntu/.azure'
Extensions directory '/home/ubuntu/.azure/cliextensions'

Python (Linux) 3.13.9 (main, Oct 28 2025, 09:10:27) [GCC 11.4.0]

Legal docs and information: aka.ms/AzureCliLegal

You have 2 update(s) available. Consider updating your CLI installation with 'az upgrade'

### Additional context

_No response_