[Issue] "azd ai agent init" lets you select un-supported locations for AI models

[pamelafox]

• Make sure you've installed the latest version using instructions

Output from azd version
azd version 1.24.0-beta.1-pr.6069275 (commit 2ef20fb) (stable)

Describe the bug

When I do "azd ai agent init", it allows me to select westcentralus and gpt-5.2, even though westcentralus does not support any models. Ideally the picker would restrict the valid locations.

This is the error you get upon deploying:

{
"error": {
"code": "InvalidTemplate",
"message": "Deployment template validation failed: 'The provided value for the template parameter 'location' is not valid. The value 'westcentralus' is not part of the allowed value(s): 'australiaeast,brazilsouth,canadacentral,canadaeast,eastus,eastus2,francecentral,germanywestcentral,italynorth,japaneast,koreacentral,northcentralus,norwayeast,polandcentral,southafricanorth,southcentralus,southeastasia,southindia,spaincentral,swedencentral,switzerlandnorth,uaenorth,uksouth,westus,westus2,westus3'.'.",
"additionalInfo": [
{
"type": "TemplateViolation",
"info": {
"lineNumber": 1,
"linePosition": 1376,
"path": "properties.template.parameters.location.allowedValues"
}
}
]
}
}

To Reproduce
"azd ai agent init"

Additional context
Add any other context about the problem here.

[JeffreyCA]

Part of the issue is that when initializing from code, we don't call the model recovery flow

Another thing is that we don't filter out unsupported locations from the location prompt. Need to also investigate how we're determining the available models in a selected location