[BUG] `VMSS` - `patchSettings.assessmentMode` cannot be set to `AutomaticByPlatform` in VMSS

### API Spec link

https://github.com/Azure/azure-rest-api-specs/blob/9ac34f238dd6b9071f486b57e9f9f1a0c43ec6f6/specification/compute/resource-manager/Microsoft.Compute/ComputeRP/stable/2023-03-01/computeRPCommon.json#L1822

### API Spec version

2023-03-01

### Describe the bug

`patchSettings.assessmentMode` cannot be set to `AutomaticByPlatform` in VMSS with the following payload:

PUT /subscriptions/000000/resourceGroups/ademo-resources/providers/Microsoft.Compute/virtualMachineScaleSets/ademo-OVMSS?api-version=2023-03-01 HTTP/1.1
X-Ms-Correlation-Request-Id: b8b9b62a-3444-26f1-a708-0d0c63e0b827
{
"location": "westeurope",
"properties": {
"additionalCapabilities": {},
"orchestrationMode": "Flexible",
"platformFaultDomainCount": 2,
"virtualMachineProfile": {
"osProfile": {
"computerNamePrefix": "ademo",
"adminUsername": "adminuser",
"adminPassword": "****",
"customData": "",
"windowsConfiguration": {
"provisionVMAgent": true,
"enableAutomaticUpdates": true,
"patchSettings": {
"patchMode": "AutomaticByPlatform",
"enableHotpatching": true,
"assessmentMode": "AutomaticByPlatform"
},
"winRM": {
"listeners": [
{
"protocol": "Http"
}
]
}
}
},
"storageProfile": {
"imageReference": {
"offer": "WindowsServer",
"publisher": "MicrosoftWindowsServer",
"sku": "2022-datacenter-azure-edition-core",
"version": "latest"
},
"osDisk": {
"caching": "ReadWrite",
"writeAcceleratorEnabled": false,
"createOption": "FromImage",
"osType": "Windows",
"managedDisk": {
"storageAccountType": "Standard_LRS"
}
}
},
"networkProfile": {
"networkInterfaceConfigurations": [
{
"name": "ademo-NetworkProfile",
"properties": {
"primary": true,
"enableAcceleratedNetworking": false,
"dnsSettings": {
"dnsServers": []
},
"ipConfigurations": [
{
"name": "PrimaryIPConfiguration",
"properties": {
"subnet": {
"id": "/subscriptions/000000/resourceGroups/ademo-resources/providers/Microsoft.Network/virtualNetworks/ademo-network/subnets/internal"
},
"primary": true,
"publicIPAddressConfiguration": {
"name": "ademo-PublicIpConfiguration",
"properties": {
"idleTimeoutInMinutes": 4,
"dnsSettings": {
"domainNameLabel": "ademo-domain-label"
},
"ipTags": [],
"publicIPAddressVersion": "IPv4"
}
},
"privateIPAddressVersion": "IPv4",
"applicationGatewayBackendAddressPools": [],
"applicationSecurityGroups": [],
"loadBalancerBackendAddressPools": []
}
}
],
"enableIPForwarding": false
}
}
],
"networkApiVersion": "2020-11-01"
},
"extensionProfile": {
"extensions": [
{
"name": "ademo-HealthExtension",
"properties": {
"autoUpgradeMinorVersion": true,
"forceUpdateTag": "",
"provisionAfterExtensions": [],
"publisher": "Microsoft.ManagedServices",
"settings": {
"port": "80",
"protocol": "http",
"requestPath": "/healthEndpoint"
},
"suppressFailures": false,
"type": "ApplicationHealthWindows",
"typeHandlerVersion": "1.0"
}
}
],
"extensionsTimeBudget": "PT1H30M"
},
"priority": "Regular"
}
},
"sku": {
"name": "Standard_F2s_v2",
"tier": "Standard",
"capacity": 1
},
"tags": {}
}

Response for https://management.azure.com/subscriptions/000000/resourceGroups/ademo-resources/providers/Microsoft.Compute/virtualMachineScaleSets/ademo-OVMSS?api-version=2023-03-01:
X-Ms-Correlation-Request-Id: b8b9b62a-3444-26f1-a708-0d0c63e0b827
X-Ms-Request-Id: 0cdacd35-da17-4e76-b0d3-77b32de098b8

{
"error": {
"code": "InvalidParameter",
"message": "'patchSettings.assessmentMode' cannot be set to 'AutomaticByPlatform' as its not supported on Virtual Machine Scale Sets.",
"target": "windowsConfiguration.patchSettings.assessmentMode"
}
}

Reference:

### Expected behavior

VMSS should be deployed successfully.

### Actual behavior

The server side returned error of "'patchSettings.assessmentMode' cannot be set to 'AutomaticByPlatform' as its not supported on Virtual Machine Scale Sets."

### Reproduction Steps

create the VMSS with the payload in the description.

### Environment

_No response_

Read the linked Compute API specification at computeRPCommon.json around line 1822 and compare its assessmentMode definition with the VMSS payload and returned InvalidParameter response. Determine whether the specification or the service behavior is inconsistent; done means the API contract and VMSS behavior agree, with the supplied reproduction succeeding or the unsupported value documented accurately.

Written by the indexing model from the issue text.