Warning for --ssh-access disabled should only show when --generate-ssh-keys is not explicitly configured.

### Describe the bug

As titled. Customers opting to use ssh key should not be warned with this.

### Related command

az aks create --generate-ssh-keys

### Errors

n/a

### Issue script & Debug output

n/a

### Expected behavior

now showing the line

`The new node pool will enable SSH access, recommended to use '--ssh-access disabled' option to disable SSH access for the node pool to make it more secure.`

### Environment Summary

azure-cli 2.78.0 *

core 2.78.0 *
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

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) 3.13.7 (main, Oct 9 2025, 05:49:51) [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_