[RequiredPropertiesMissingInResourceModel] some model definitions are mistakenly identified as resource models

**Describe the bug**
It seems that some definitions that are not resource models are also considered resource models.

https://github.com/Azure/azure-rest-api-specs/pull/33237/checks?check_run_id=38861178342

https://github.com/Azure/azure-rest-api-specs/blob/e77744e766cf3251d8f4242605d8acdbe2c7b8fe/specification/containerservice/resource-manager/Microsoft.ContainerService/aks/preview/2025-01-02-preview/managedClusters.json#L10258

```json
"NodeImageVersionsListResult": {
"description": "Holds an array NodeImageVersions",
"properties": {
"value": {
"description": "Array of AKS Node Image versions.",
"items": {
"$ref": "#/definitions/NodeImageVersion"
},
"type": "array",
"x-ms-identifiers": [
"fullName"
]
},
"nextLink": {
"description": "The URL to get the next set of machine results.",
"format": "uri",
"readOnly": true,
"type": "string"
}
},
"type": "object"
},
"NodeImageVersion": {
"description": "node image version profile for given major.minor.patch release.",
"properties": {
"os": {
"description": "The operating system of the node image. Example: AKSUbuntu",
"type": "string"
},
"sku": {
"description": "The SKU or flavor of the node image. Example: 2004gen2containerd",
"type": "string"
},
"version": {
"description": "major.minor.patch version of the node image version release. Example: 2024.02.02",
"type": "string"
},
"fullName": {
"description": "The OS + SKU + version of the node image. Example: AKSUbuntu-1804gen2containerd-2024.02.02",
"type": "string"
}
},
"type": "object"
}
},
```

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