versionUpgradeOption: 'string' is not working as expected.

### Resource Type

Microsoft.CognitiveServices/accounts/deployments

### Api Version

2023-05-01

### Issue Type

Property(s) do not have expected effect on deployment

### Other Notes

Below bicep deployment fails with error:
**[{"code":"DeploymentModelNotSupported","message":"Creating account deployment is not supported by the model 'gpt-4-32k'. This is usually because there are better models available for the similar functionality."}]** for all options of **versionUpgradeOption** ['NoAutoUpgrade', 'OnceCurrentVersionExpired', 'OnceNewDefaultVersionAvailable']
while the deployment succeeds when we specify the version explicitly as '0613'.
We encountered this error as older version '0314' got expired.

### Bicep Repro
```bicep
param cognitiveServiceName string = 'test'
param location string = 'eastus'
param modelName string = 'gpt-4-32k'
param capacityInThousandTPM int = 2

targetScope = 'resourceGroup'

var modelDeploymentName = 'md-${modelName}'

@allowed([
'S0'
])
param sku string = 'S0'

resource cognitiveService 'Microsoft.CognitiveServices/accounts@2021-10-01' = {
name: cognitiveServiceName
location: location
sku: {
name: sku
}
kind: 'OpenAI'
properties: {
apiProperties: {
statisticsEnabled: false
}
publicNetworkAccess :'Disabled'
customSubDomainName: toLower(cognitiveServiceName)
}
}

resource cognitiveServicesAccounts 'Microsoft.CognitiveServices/accounts/deployments@2023-05-01'= {
name: modelDeploymentName
parent: cognitiveService
sku : {
name : 'Standard'
capacity: capacityInThousandTPM
}
properties: {
model: {
format: 'OpenAI'
name: modelName
}
versionUpgradeOption: 'OnceNewDefaultVersionAvailable'
}
}

output modelName string = modelDeploymentName

output cognitiveServiceName string = cognitiveService.name
output congitiveServiceRI string = cognitiveService.id
```

### Confirm

- [X] I have read the troubleshooting guide and looked for duplicates.

Start by reproducing the Bicep deployment for Microsoft.CognitiveServices/accounts/deployments@2023-05-01 with gpt-4-32k and each versionUpgradeOption value. Compare the behavior with the explicit model version '0613' and inspect how this resource type is defined in bicep-types-az. Done means the mismatch is resolved or clearly documented for all listed options.

Written by the indexing model from the issue text.